Investment Risks |
Feb. 28, 2026 |
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| AAM BRENTVIEW DIVIDEND GROWTH ETF | Dividend-Paying Securities Risk Member | |
| Prospectus [Line Items] | |
| Risk [Text Block] | Dividend-Paying Securities Risk. Investment in dividend-paying securities could cause the Fund to underperform similar funds that invest without consideration of a company’s track record of paying dividends. Securities of companies with a history of paying dividends may not participate in a broad market advance to the same degree as most other securities, and a sharp rise in interest rates or economic downturn could cause a company to unexpectedly reduce or eliminate its dividend. There is no guarantee that the issuers of the securities held by the Fund will declare dividends in the future or that, if declared, they will remain at their current levels or increase over time. |
| AAM BRENTVIEW DIVIDEND GROWTH ETF | Equity Market Risk Member | |
| Prospectus [Line Items] | |
| Risk [Text Block] | Equity Market Risk. The equity securities held in the Fund’s portfolio may experience sudden, unpredictable drops in value or long periods of decline in value. This may occur because of factors that affect securities markets generally or factors affecting specific issuers, industries, or sectors in which the Fund invests. Common stocks are generally exposed to greater risk than other types of securities, such as preferred stock and debt obligations, because common stockholders generally have inferior rights to receive payment from issuers. In addition, local, regional or global events such as war, including Russia’s invasion of Ukraine, acts of terrorism, spread of infectious diseases or other public health issues (such as the global pandemic caused by the COVID-19 virus), recessions, rising inflation, trade wars and tariffs, or other events could have a significant negative impact on the Fund and its investments. Such events may affect certain geographic regions, countries, sectors and industries more significantly than others. Such events could adversely affect the prices and liquidity of the Fund’s portfolio securities or other instruments and could result in disruptions in the trading markets. |
| AAM BRENTVIEW DIVIDEND GROWTH ETF | ETF Risks Member | |
| Prospectus [Line Items] | |
| Risk [Text Block] | ETF Risks. The Fund is an ETF, and, as a result of an ETF’s structure, it is exposed to the following risks: ◦Authorized Participants, Market Makers, and Liquidity Providers Concentration Risk. The Fund has a limited number of financial institutions that may act as Authorized Participants (“APs”). In addition, there may be a limited number of market makers and/or liquidity providers in the marketplace. To the extent either of the following events occur, Shares may trade at a material discount to NAV and possibly face delisting: (i) APs exit the business or otherwise become unable to process creation and/or redemption orders and no other APs step forward to perform these services, or (ii) market makers and/or liquidity providers exit the business or significantly reduce their business activities and no other entities step forward to perform their functions. ◦Costs of Buying or Selling Shares. Due to the costs of buying or selling Shares, including brokerage commissions imposed by brokers and bid-ask spreads, frequent trading of Shares may significantly reduce investment results and an investment in Shares may not be advisable for investors who anticipate regularly making small investments. ◦Shares May Trade at Prices Other Than NAV. As with all ETFs, Shares may be bought and sold in the secondary market at market prices. Although it is expected that the market price of Shares will approximate the Fund’s NAV, there may be times when the market price of Shares is more than the NAV intra-day (premium) or less than the NAV intra-day (discount) due to supply and demand of Shares or during periods of market volatility. This risk is heightened in times of market volatility, periods of steep market declines, and periods when there is limited trading activity for Shares in the secondary market, in which case such premiums or discounts may be significant. ◦Trading. Although Shares are listed for trading on NYSE Arca, Inc. (the “Exchange”) and may be traded on U.S. exchanges other than the Exchange, there can be no assurance that Shares will trade with any volume, or at all, on any stock exchange. There can be no assurance that an active trading market for such Shares will develop or be maintained. In stressed market conditions, the liquidity of Shares may begin to mirror the liquidity of the Fund’s underlying portfolio holdings, which can be significantly less liquid than Shares, and this could lead to differences between the market price of the Shares and the underlying value of those Shares.
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| AAM BRENTVIEW DIVIDEND GROWTH ETF | ETF Risks, Authorized Participants, Market Makers And Liquidity Providers Concentration Risk Member | |
| Prospectus [Line Items] | |
| Risk [Text Block] | Authorized Participants, Market Makers, and Liquidity Providers Concentration Risk. The Fund has a limited number of financial institutions that may act as Authorized Participants (“APs”). In addition, there may be a limited number of market makers and/or liquidity providers in the marketplace. To the extent either of the following events occur, Shares may trade at a material discount to NAV and possibly face delisting: (i) APs exit the business or otherwise become unable to process creation and/or redemption orders and no other APs step forward to perform these services, or (ii) market makers and/or liquidity providers exit the business or significantly reduce their business activities and no other entities step forward to perform their functions. |
| AAM BRENTVIEW DIVIDEND GROWTH ETF | ETF Risks, Costs Of Buying Or Selling Shares Risk Member | |
| Prospectus [Line Items] | |
| Risk [Text Block] | Costs of Buying or Selling Shares. Due to the costs of buying or selling Shares, including brokerage commissions imposed by brokers and bid-ask spreads, frequent trading of Shares may significantly reduce investment results and an investment in Shares may not be advisable for investors who anticipate regularly making small investments. |
| AAM BRENTVIEW DIVIDEND GROWTH ETF | ETF Risks, Shares May Trade At Prices Other Than NAV Risk Member | |
| Prospectus [Line Items] | |
| Risk [Text Block] | Shares May Trade at Prices Other Than NAV. As with all ETFs, Shares may be bought and sold in the secondary market at market prices. Although it is expected that the market price of Shares will approximate the Fund’s NAV, there may be times when the market price of Shares is more than the NAV intra-day (premium) or less than the NAV intra-day (discount) due to supply and demand of Shares or during periods of market volatility. This risk is heightened in times of market volatility, periods of steep market declines, and periods when there is limited trading activity for Shares in the secondary market, in which case such premiums or discounts may be significant. |
| AAM BRENTVIEW DIVIDEND GROWTH ETF | ETF Risks, Trading Risk Member | |
| Prospectus [Line Items] | |
| Risk [Text Block] | Trading. Although Shares are listed for trading on NYSE Arca, Inc. (the “Exchange”) and may be traded on U.S. exchanges other than the Exchange, there can be no assurance that Shares will trade with any volume, or at all, on any stock exchange. There can be no assurance that an active trading market for such Shares will develop or be maintained. In stressed market conditions, the liquidity of Shares may begin to mirror the liquidity of the Fund’s underlying portfolio holdings, which can be significantly less liquid than Shares, and this could lead to differences between the market price of the Shares and the underlying value of those Shares. |
| AAM BRENTVIEW DIVIDEND GROWTH ETF | Management Risk Member | |
| Prospectus [Line Items] | |
| Risk [Text Block] | Management Risk. The Fund is actively managed and may not meet its investment objective based on the Adviser’s success or failure to implement investment strategies for the Fund. |
| AAM BRENTVIEW DIVIDEND GROWTH ETF | Market Capitalization Risk Member | |
| Prospectus [Line Items] | |
| Risk [Text Block] | Market Capitalization Risk. ◦Large-Capitalization Investing Risk. The securities of large-capitalization companies may be relatively mature compared to smaller companies and therefore subject to slower growth during times of economic expansion. Large-capitalization companies may also be unable to respond quickly to new competitive challenges, such as changes in technology and consumer tastes. ◦Mid-Capitalization Investing Risk. The securities of mid-capitalization companies may be more vulnerable to adverse issuer, market, political, or economic developments than securities of large-capitalization companies, but they may also be subject to slower growth than small-capitalization companies during times of economic expansion. The securities of mid-capitalization companies generally trade in lower volumes and are subject to greater and more unpredictable price changes than large capitalization stocks or the stock market as a whole. Mid-capitalization companies may be particularly sensitive to changes in interest rates, government regulation, borrowing costs, and earnings.
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| AAM BRENTVIEW DIVIDEND GROWTH ETF | Market Capitalization Risk, Large-Capitalization Investing Risk Member | |
| Prospectus [Line Items] | |
| Risk [Text Block] | Large-Capitalization Investing Risk. The securities of large-capitalization companies may be relatively mature compared to smaller companies and therefore subject to slower growth during times of economic expansion. Large-capitalization companies may also be unable to respond quickly to new competitive challenges, such as changes in technology and consumer tastes. |
| AAM BRENTVIEW DIVIDEND GROWTH ETF | Market Capitalization Risk, Mid-Capitalization Investing Member | |
| Prospectus [Line Items] | |
| Risk [Text Block] | Mid-Capitalization Investing Risk. The securities of mid-capitalization companies may be more vulnerable to adverse issuer, market, political, or economic developments than securities of large-capitalization companies, but they may also be subject to slower growth than small-capitalization companies during times of economic expansion. The securities of mid-capitalization companies generally trade in lower volumes and are subject to greater and more unpredictable price changes than large capitalization stocks or the stock market as a whole. Mid-capitalization companies may be particularly sensitive to changes in interest rates, government regulation, borrowing costs, and earnings. |
| AAM BRENTVIEW DIVIDEND GROWTH ETF | Sector Risk Member | |
| Prospectus [Line Items] | |
| Risk [Text Block] | Sector Risk. To the extent the Fund invests more heavily in particular sectors of the economy, its performance will be especially sensitive to developments that significantly affect those sectors. The Fund may invest a significant portion of its assets in the following sectors and, therefore, the performance of the Fund could be negatively impacted by events affecting each of these sectors. ◦Information Technology Sector Risk. Market or economic factors impacting information technology companies and companies that rely heavily on technological advances could have a significant effect on the value of the Fund’s investments. The value of stocks of information technology companies and companies that rely heavily on technology is particularly vulnerable to rapid changes in technology product cycles, rapid product obsolescence, government regulation and competition, both domestically and internationally, including competition from foreign competitors with lower production costs. Stocks of information technology companies and companies that rely heavily on technology, especially those of smaller, less-seasoned companies, tend to be more volatile than the overall market. Information technology companies are heavily dependent on patent and intellectual property rights, the loss or impairment of which may adversely affect profitability. |
| AAM BRENTVIEW DIVIDEND GROWTH ETF | Sector Risk, Information Technology Sector Risk Member | |
| Prospectus [Line Items] | |
| Risk [Text Block] | Information Technology Sector Risk. Market or economic factors impacting information technology companies and companies that rely heavily on technological advances could have a significant effect on the value of the Fund’s investments. The value of stocks of information technology companies and companies that rely heavily on technology is particularly vulnerable to rapid changes in technology product cycles, rapid product obsolescence, government regulation and competition, both domestically and internationally, including competition from foreign competitors with lower production costs. Stocks of information technology companies and companies that rely heavily on technology, especially those of smaller, less-seasoned companies, tend to be more volatile than the overall market. Information technology companies are heavily dependent on patent and intellectual property rights, the loss or impairment of which may adversely affect profitability. |
| AAM BRENTVIEW DIVIDEND GROWTH ETF | Securities Lending Risk Member | |
| Prospectus [Line Items] | |
| Risk [Text Block] | Securities Lending Risk. The Fund may engage in securities lending. There are certain risks associated with securities lending, including the risk that the borrower may fail to return the securities on a timely basis or even the loss of rights in the collateral deposited by the borrower, if the borrower should fail financially. The Fund could also lose money in the event of a decline in the value of collateral provided for loaned securities or a decline in the value of any investments made with cash collateral. As a result, the Fund may lose money. |
| AAM BRENTVIEW DIVIDEND GROWTH ETF | Risk Lose Money [Member] | |
| Prospectus [Line Items] | |
| Risk [Text Block] | As with any investment, there is a risk that you could lose all or a portion of your investment in the Fund. |
| AAM Crescent CLO ETF | ETF Risks Member | |
| Prospectus [Line Items] | |
| Risk [Text Block] | ETF Risks. The Fund is an ETF, and, as a result of an ETF’s structure, it is exposed to the following risks: ◦Authorized Participants, Market Makers, and Liquidity Providers Concentration Risk. The Fund has a limited number of financial institutions that may act as Authorized Participants (“APs”). In addition, there may be a limited number of market makers and/or liquidity providers in the marketplace. To the extent either of the following events occur, Shares may trade at a material discount to NAV and possibly face delisting: (i) APs exit the business or otherwise become unable to process creation and/or redemption orders and no other APs step forward to perform these services, or (ii) market makers and/or liquidity providers exit the business or significantly reduce their business activities and no other entities step forward to perform their functions. ◦Cash Redemption Risk. When the Fund’s investment strategy requires it to redeem Shares for cash or to otherwise include cash as part of its redemption proceeds, it may be required to sell or unwind portfolio investments in order to obtain the cash needed to distribute redemption proceeds. This may cause the Fund to recognize a capital gain that it might not have recognized if it had made a redemption in-kind (i.e., distribute securities as payment of redemption proceeds). As a result, the Fund may pay out higher annual capital gain distributions than if the in-kind redemption process was used. ◦Costs of Buying or Selling Shares. Due to the costs of buying or selling Shares, including brokerage commissions imposed by brokers and bid-ask spreads, frequent trading of Shares may significantly reduce investment results and an investment in Shares may not be advisable for investors who anticipate regularly making small investments. ◦Early Close/Trading Halt. An exchange or market may close early or issue trading halts on specific securities or financial instruments. The ability to trade certain securities or financial instruments may be restricted, which may disrupt the Fund’s creation and redemption process, potentially affect the price at which the Fund’s shares trade in the secondary market, and/or result in the Fund being unable to trade certain securities or financial instruments. In these circumstances, the Fund may be unable to rebalance its portfolio, may be unable to accurately price its investments, and/or may incur substantial trading losses. ◦Listing Standards Risk. The Fund is required to comply with listing requirements adopted by the Exchange. Non-compliance with such requirements may result in the Fund’s shares being delisted by the Exchange. Any resulting liquidation of the Fund could cause the Fund to incur elevated transaction costs and could result in negative tax consequences for its shareholders. ◦Shares May Trade at Prices Other Than NAV. As with all ETFs, Shares may be bought and sold in the secondary market at market prices. Although it is expected that the market price of Shares will approximate the Fund’s NAV, there may be times when the market price of Shares is more than the NAV intra-day (premium) or less than the NAV intra-day (discount) due to supply and demand of Shares or during periods of market volatility. This risk is heightened in times of market volatility, periods of steep market declines, and periods when there is limited trading activity for Shares in the secondary market, in which case such premiums or discounts may be significant. ◦Trading. Although shares of the Fund are listed for trading on the NYSE Arca (the “Exchange”), there can be no assurance that an active trading market for shares will develop or be maintained or that shares will trade with any volume, or at all, on any stock exchange. In stressed market conditions, the market for shares of the Fund may become less liquid in response to deteriorating liquidity in the markets for the Fund’s underlying portfolio holdings. This adverse effect on liquidity for the Fund’s shares, in turn, can lead to differences between the market price of the Fund’s shares and the underlying value of those shares, which may result in a widening of the bid and ask spread. In addition, trading in Fund shares may be halted due to market conditions or for reasons that, in the view of the Exchange, make trading in shares of the Fund inadvisable.
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| AAM Crescent CLO ETF | ETF Risks, Authorized Participants, Market Makers And Liquidity Providers Concentration Risk Member | |
| Prospectus [Line Items] | |
| Risk [Text Block] | Authorized Participants, Market Makers, and Liquidity Providers Concentration Risk. The Fund has a limited number of financial institutions that may act as Authorized Participants (“APs”). In addition, there may be a limited number of market makers and/or liquidity providers in the marketplace. To the extent either of the following events occur, Shares may trade at a material discount to NAV and possibly face delisting: (i) APs exit the business or otherwise become unable to process creation and/or redemption orders and no other APs step forward to perform these services, or (ii) market makers and/or liquidity providers exit the business or significantly reduce their business activities and no other entities step forward to perform their functions. |
| AAM Crescent CLO ETF | ETF Risks, Costs Of Buying Or Selling Shares Risk Member | |
| Prospectus [Line Items] | |
| Risk [Text Block] | Costs of Buying or Selling Shares. Due to the costs of buying or selling Shares, including brokerage commissions imposed by brokers and bid-ask spreads, frequent trading of Shares may significantly reduce investment results and an investment in Shares may not be advisable for investors who anticipate regularly making small investments. |
| AAM Crescent CLO ETF | ETF Risks, Shares May Trade At Prices Other Than NAV Risk Member | |
| Prospectus [Line Items] | |
| Risk [Text Block] | Shares May Trade at Prices Other Than NAV. As with all ETFs, Shares may be bought and sold in the secondary market at market prices. Although it is expected that the market price of Shares will approximate the Fund’s NAV, there may be times when the market price of Shares is more than the NAV intra-day (premium) or less than the NAV intra-day (discount) due to supply and demand of Shares or during periods of market volatility. This risk is heightened in times of market volatility, periods of steep market declines, and periods when there is limited trading activity for Shares in the secondary market, in which case such premiums or discounts may be significant. |
| AAM Crescent CLO ETF | ETF Risks, Trading Risk Member | |
| Prospectus [Line Items] | |
| Risk [Text Block] | Trading. Although shares of the Fund are listed for trading on the NYSE Arca (the “Exchange”), there can be no assurance that an active trading market for shares will develop or be maintained or that shares will trade with any volume, or at all, on any stock exchange. In stressed market conditions, the market for shares of the Fund may become less liquid in response to deteriorating liquidity in the markets for the Fund’s underlying portfolio holdings. This adverse effect on liquidity for the Fund’s shares, in turn, can lead to differences between the market price of the Fund’s shares and the underlying value of those shares, which may result in a widening of the bid and ask spread. In addition, trading in Fund shares may be halted due to market conditions or for reasons that, in the view of the Exchange, make trading in shares of the Fund inadvisable. |
| AAM Crescent CLO ETF | Active Management Risk Member | |
| Prospectus [Line Items] | |
| Risk [Text Block] | Active Management Risk. The Fund is actively managed and may not meet its investment objective based on the Sub-Adviser’s success or failure to implement investment strategies for the Fund. The Sub-Adviser relies on quantitative and qualitative data that may prove to be incorrect or incomplete. |
| AAM Crescent CLO ETF | Bank Loans Risk Member | |
| Prospectus [Line Items] | |
| Risk [Text Block] | Bank Loans Risk. The CLOs in which the Fund invests are typically collateralized by bank loans. Bank loans are typically originated and structured by banks and institutions on behalf of corporate borrowers. Bank loans are typically distributed by the arranging banks and private client lenders to investors primarily consisting of: CLOs; senior secured loan and high yield bond mutual funds; closed-end funds, hedge funds, banks, insurance companies and finance companies. Investments in bank loans may expose the Fund to different risks, including liquidity risk, price volatility, ability to restructure loans, credit risks and less protective loan documentation. |
| AAM Crescent CLO ETF | CLO Leverage Risk Member | |
| Prospectus [Line Items] | |
| Risk [Text Block] | CLO Leverage Risk. CLOs are typically leveraged, and such leverage will magnify the loss on CLO investments, which may in turn magnify the loss experienced by the Fund. The cumulative effect of leverage with respect to any investments in a market that moves adversely to such investments could result in a substantial loss that would be greater than if the Fund’s investments were not leveraged.
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| AAM Crescent CLO ETF | CLO Manager Risk Member | |
| Prospectus [Line Items] | |
| Risk [Text Block] | CLO Manager Risk. The Fund intends to invest in CLO securities issued by CLOs that are managed by third-party collateral managers. The Fund is dependent on the skill and expertise of such managers. CLO managers are responsible for selecting, managing, and replacing the underlying bank loans within a CLO. There can be no guarantee that any collateral manager will continue to manage such CLO through the life of the investment. Collateral managers are subject to removal or replacement by other holders of CLO securities or may voluntarily resign or may be acquired by another firm. |
| AAM Crescent CLO ETF | CLO Risk Member | |
| Prospectus [Line Items] | |
| Risk [Text Block] | CLO Risk. The risks of investing in CLO securities include both the credit risk associated with the underlying loans combined with the risks associated with the CLO structure governing the priority of payments (and any legal and counterparty risk associated with carrying out the priority of payments). At certain times, this Fund may increase its exposure to and invest primarily in BBB+, BBB, and BBB- rated tranches (or equivalent ratings by a NRSRO); however, these ratings do not constitute a guarantee of credit quality and it’s possible that under stressed market environments these tranches could experience substantial losses due to defaults, write-downs of the equity or other subordinated tranches, increased sensitivity to defaults due to underlying collateral default and impairment of subordinated tranches, market anticipation of defaults, and general market aversion to CLO securities as an asset class. The most common risks associated with investing in CLOs are interest rate risk, credit risk, liquidity risk, prepayment risk (i.e., the risk that in a declining interest rate period CLO tranches could be refinanced or paid off prior to their maturities and the Fund would then have to reinvest the proceeds at a lower rate), and the risk of defaults of the underlying assets. ◦Covenant Lite Loans Risk. The Fund may obtain exposure to loans that are “covenant lite.” Covenants contained in loan documentation are intended to protect lenders by imposing certain restrictions and other limitations on a borrower’s operations or assets and by providing certain information and consent rights to lenders. Covenant lite loans may lack financial maintenance covenants that in certain situations can allow lenders to claim a default on the loan to seek to protect the interests of the lenders. The absence of financial maintenance covenants in a covenant lite loan might result in a lower recovery in the event of a default by the borrower. Covenant lite loans have become much more prevalent in recent years. ◦Mezzanine CLO Risk. At certain times, the Fund may invest primarily in BBB+, BBB, BBB- rated tranches of CLO securities that are subordinate to higher-rated tranches (e.g., tranches rated AAA+ through A-) in terms of payment priority. Subordinated (i.e., mezzanine) CLO tranches are subject to higher credit risk and liquidity risk relative to more senior CLO tranches. To the extent a CLO or its underlying loans experience default or are having difficulty making principal and/or interest payments, subordinated CLO tranches will be more likely to experience adverse impacts, and such impacts will be more severe, relative to more senior or higher-rated CLO securities, which in turn will adversely affect the performance of the Fund. In a CLO structure, senior tranches have payment priority over mezzanine tranches.
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| AAM Crescent CLO ETF | CLO Risk, Covenant Lite Loans Risk Member | |
| Prospectus [Line Items] | |
| Risk [Text Block] | Covenant Lite Loans Risk. The Fund may obtain exposure to loans that are “covenant lite.” Covenants contained in loan documentation are intended to protect lenders by imposing certain restrictions and other limitations on a borrower’s operations or assets and by providing certain information and consent rights to lenders. Covenant lite loans may lack financial maintenance covenants that in certain situations can allow lenders to claim a default on the loan to seek to protect the interests of the lenders. The absence of financial maintenance covenants in a covenant lite loan might result in a lower recovery in the event of a default by the borrower. Covenant lite loans have become much more prevalent in recent years. |
| AAM Crescent CLO ETF | CLO Risk, Mezzanine CLO Risk Member | |
| Prospectus [Line Items] | |
| Risk [Text Block] | Mezzanine CLO Risk. At certain times, the Fund may invest primarily in BBB+, BBB, BBB- rated tranches of CLO securities that are subordinate to higher-rated tranches (e.g., tranches rated AAA+ through A-) in terms of payment priority. Subordinated (i.e., mezzanine) CLO tranches are subject to higher credit risk and liquidity risk relative to more senior CLO tranches. To the extent a CLO or its underlying loans experience default or are having difficulty making principal and/or interest payments, subordinated CLO tranches will be more likely to experience adverse impacts, and such impacts will be more severe, relative to more senior or higher-rated CLO securities, which in turn will adversely affect the performance of the Fund. In a CLO structure, senior tranches have payment priority over mezzanine tranches. |
| AAM Crescent CLO ETF | Covenant Lite Loans Risk Member | |
| Prospectus [Line Items] | |
| Risk [Text Block] | Covenant Lite Loan Risk. The Fund may obtain exposure to loans that are “covenant lite.” Covenants contained in loan documentation are intended to protect lenders by imposing certain restrictions and other limitations on a borrower’s operations or assets and by providing certain information and consent rights to lenders. Covenant lite loans may lack financial maintenance covenants that in certain situations can allow lenders to claim a default on the loan to seek to protect the interests of the lenders. The absence of financial maintenance covenants in a covenant lite loan might result in a lower recovery in the event of a default by the borrower. Covenant lite loans have become much more prevalent in recent years. |
| AAM Crescent CLO ETF | Debt Securities Risk Member | |
| Prospectus [Line Items] | |
| Risk [Text Block] | Debt Securities Risk. The Fund’s investment in debt securities may subject it to the following risks: ◦Call Risk. CLO securities are issued with a non-call period. After the end of the non-call period, the majority investor in the equity tranche can call (i.e. redeem or refinance) the securities issued by the CLO partially or in full. The Fund may not be able to accurately predict when or which of its CLO investments may be called, resulting in the Fund having to reinvest the proceeds in unfavorable market conditions (i.e. at lower spreads), which could cause a decline in the Fund’s income. ◦Credit Risk. Debt issuers and other counterparties may not honor their obligations. For CLOs, the primary source of credit risk is the ability of the underlying portfolio of loans to generate sufficient cash flow to pay investors on a full and timely basis when principal and/or interest payments are due. Default in payment on the underlying loans will result in less cash flow from the underlying portfolio and, in turn, less funds available to pay investors in the CLO. ◦Extension Risk. When interest rates rise, certain obligations will be paid off by the obligor more slowly than anticipated, causing the value of these securities to fall. Rising interest rates tend to extend the duration of securities, making them more sensitive to future changes in interest rates. ◦Floating Rate Obligations Risk. Securities with floating or variable interest rates can be less sensitive to interest rate changes than securities with fixed interest rates, but may decline in value if their interest rates do not rise as much, or as quickly, as interest rates in general. Conversely, floating rate securities will not generally increase in value if interest rates decline. A decline in interest rates may result in a reduction of income received from floating rate securities held by the Fund and may adversely affect the value of the Fund’s shares. ◦Interest Rate Risk. As interest rates decrease, issuers of the underlying loan obligations may refinance any floating rate loans, which will result in a reduction in the principal value of the CLO’s portfolio and require the CLO to reinvest cash at an inopportune time. Conversely, as interest rates rise, borrowers with floating rate loans may experience difficulty in making payments, resulting in delinquencies and defaults, which may result in a reduction in cash flow to the CLO and the CLO investors, including the Fund. An increase in interest rates may cause the value of fixed-income securities held by the Fund to decline. The Fund may be subject to a greater risk of rising interest rates due to inflationary trends and the effect of government fiscal and monetary policy initiatives and resulting market reaction to those initiatives. ◦Liquidity Risk. Liquidity risk refers to the possibility that the Fund may not be able to sell or buy a security or close out an investment contract at a favorable price or time. Consequently, the Fund may have to accept a lower price to sell a security, sell other securities to raise cash, or give up an investment opportunity, any of which could have a negative effect on the Fund’s performance. Infrequent trading of securities also may lead to an increase in their price volatility. CLOs, and their underlying loan obligations, are typically not registered for sale to the public and therefore are subject to certain restrictions on transfer and sale, potentially making them less liquid than other types of securities. ◦Loan Prepayment Risk. This is the risk that a borrower will prepay some or the entire principal owed to the Fund. If that happens, the Fund may have to replace the security by investing the proceeds in a security with a lower yield. This could reduce the share price and income distributions of the Fund.
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| AAM Crescent CLO ETF | Debt Securities Risk, Call Risk Member | |
| Prospectus [Line Items] | |
| Risk [Text Block] | Call Risk. CLO securities are issued with a non-call period. After the end of the non-call period, the majority investor in the equity tranche can call (i.e. redeem or refinance) the securities issued by the CLO partially or in full. The Fund may not be able to accurately predict when or which of its CLO investments may be called, resulting in the Fund having to reinvest the proceeds in unfavorable market conditions (i.e. at lower spreads), which could cause a decline in the Fund’s income. |
| AAM Crescent CLO ETF | Debt Securities Risk, Credit Risk Member | |
| Prospectus [Line Items] | |
| Risk [Text Block] | Credit Risk. Debt issuers and other counterparties may not honor their obligations. For CLOs, the primary source of credit risk is the ability of the underlying portfolio of loans to generate sufficient cash flow to pay investors on a full and timely basis when principal and/or interest payments are due. Default in payment on the underlying loans will result in less cash flow from the underlying portfolio and, in turn, less funds available to pay investors in the CLO. |
| AAM Crescent CLO ETF | Debt Securities Risk, Extension Risk Member | |
| Prospectus [Line Items] | |
| Risk [Text Block] | Extension Risk. When interest rates rise, certain obligations will be paid off by the obligor more slowly than anticipated, causing the value of these securities to fall. Rising interest rates tend to extend the duration of securities, making them more sensitive to future changes in interest rates. |
| AAM Crescent CLO ETF | Debt Securities Risk, Floating Rate Obligations Risk Member | |
| Prospectus [Line Items] | |
| Risk [Text Block] | Floating Rate Obligations Risk. Securities with floating or variable interest rates can be less sensitive to interest rate changes than securities with fixed interest rates, but may decline in value if their interest rates do not rise as much, or as quickly, as interest rates in general. Conversely, floating rate securities will not generally increase in value if interest rates decline. A decline in interest rates may result in a reduction of income received from floating rate securities held by the Fund and may adversely affect the value of the Fund’s shares. |
| AAM Crescent CLO ETF | Debt Securities Risk, Interest Rate Risk Member | |
| Prospectus [Line Items] | |
| Risk [Text Block] | Interest Rate Risk. As interest rates decrease, issuers of the underlying loan obligations may refinance any floating rate loans, which will result in a reduction in the principal value of the CLO’s portfolio and require the CLO to reinvest cash at an inopportune time. Conversely, as interest rates rise, borrowers with floating rate loans may experience difficulty in making payments, resulting in delinquencies and defaults, which may result in a reduction in cash flow to the CLO and the CLO investors, including the Fund. An increase in interest rates may cause the value of fixed-income securities held by the Fund to decline. The Fund may be subject to a greater risk of rising interest rates due to inflationary trends and the effect of government fiscal and monetary policy initiatives and resulting market reaction to those initiatives. |
| AAM Crescent CLO ETF | Debt Securities Risk, Liquidity Risk Member | |
| Prospectus [Line Items] | |
| Risk [Text Block] | Liquidity Risk. Liquidity risk refers to the possibility that the Fund may not be able to sell or buy a security or close out an investment contract at a favorable price or time. Consequently, the Fund may have to accept a lower price to sell a security, sell other securities to raise cash, or give up an investment opportunity, any of which could have a negative effect on the Fund’s performance. Infrequent trading of securities also may lead to an increase in their price volatility. CLOs, and their underlying loan obligations, are typically not registered for sale to the public and therefore are subject to certain restrictions on transfer and sale, potentially making them less liquid than other types of securities. |
| AAM Crescent CLO ETF | Debt Securities Risk, Loan Prepayment Risk Member | |
| Prospectus [Line Items] | |
| Risk [Text Block] | Loan Prepayment Risk. This is the risk that a borrower will prepay some or the entire principal owed to the Fund. If that happens, the Fund may have to replace the security by investing the proceeds in a security with a lower yield. This could reduce the share price and income distributions of the Fund. |
| AAM Crescent CLO ETF | ETF Risks, Cash Redemption Risk Member | |
| Prospectus [Line Items] | |
| Risk [Text Block] | Cash Redemption Risk. When the Fund’s investment strategy requires it to redeem Shares for cash or to otherwise include cash as part of its redemption proceeds, it may be required to sell or unwind portfolio investments in order to obtain the cash needed to distribute redemption proceeds. This may cause the Fund to recognize a capital gain that it might not have recognized if it had made a redemption in-kind (i.e., distribute securities as payment of redemption proceeds). As a result, the Fund may pay out higher annual capital gain distributions than if the in-kind redemption process was used. |
| AAM Crescent CLO ETF | ETF Risks, Early Close/Trading Halt Risk Member | |
| Prospectus [Line Items] | |
| Risk [Text Block] | Early Close/Trading Halt. An exchange or market may close early or issue trading halts on specific securities or financial instruments. The ability to trade certain securities or financial instruments may be restricted, which may disrupt the Fund’s creation and redemption process, potentially affect the price at which the Fund’s shares trade in the secondary market, and/or result in the Fund being unable to trade certain securities or financial instruments. In these circumstances, the Fund may be unable to rebalance its portfolio, may be unable to accurately price its investments, and/or may incur substantial trading losses. |
| AAM Crescent CLO ETF | ETF Risks, Listing Standards Risk Member | |
| Prospectus [Line Items] | |
| Risk [Text Block] | Listing Standards Risk. The Fund is required to comply with listing requirements adopted by the Exchange. Non-compliance with such requirements may result in the Fund’s shares being delisted by the Exchange. Any resulting liquidation of the Fund could cause the Fund to incur elevated transaction costs and could result in negative tax consequences for its shareholders.
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| AAM Crescent CLO ETF | Extended Settlement Risk Member | |
| Prospectus [Line Items] | |
| Risk [Text Block] | Extended Settlement Risk. CLOs purchased in the primary market (rather than from the secondary market) typically experience extended or delayed settlement periods, often longer than seven days. During the settlement window, between purchasing and settlement, these securities may be less liquid than CLOs available on the secondary market. As a result, the Fund’s ability to acquire or dispose of CLOs at a price and time the Fund deems advantageous may be impaired. In such circumstances the Fund bears a risk of loss if the value of the CLO declines before the settlement date or if the Fund is required to sell the CLO prior to settlement. There is also the risk that the security will not be issued or that the counterparty will not meet its obligation, resulting in a loss of the investment opportunity. |
| AAM Crescent CLO ETF | Income Risk Member | |
| Prospectus [Line Items] | |
| Risk [Text Block] | Income Risk. The Fund’s income may decline if interest rates fall. This decline in income would occur because the CLO debt instruments held by the Fund generally all have floating or variable interest rates. |
| AAM Crescent CLO ETF | Market Events Risk Member | |
| Prospectus [Line Items] | |
| Risk [Text Block] | Market Events Risk. One or more markets in which the Fund invests may go down in value, including the possibility that the markets will go down sharply and unpredictably. This may be due to numerous factors, including interest rates, the outlook for corporate profits, the health of the national and world economies, national and world social and political events, and the fluctuation of other stock markets around the world. |
| AAM Crescent CLO ETF | New Fund Risk Member | |
| Prospectus [Line Items] | |
| Risk [Text Block] | New Fund Risk. The Fund is a recently organized investment company with no operating history. As a result, prospective investors have no track record or history on which to base their investment decision. |
| AAM Crescent CLO ETF | Other Investment Companies Risk Member | |
| Prospectus [Line Items] | |
| Risk [Text Block] | Other Investment Companies Risk. The risks of investing in other ETFs typically reflect the risks associated with the investment strategies of the other ETFs and the types of instruments in which the other ETFs invest. By investing in another ETF, the Fund becomes a shareholder of that ETF and bears its proportionate share of the fees and expenses of the other ETF. The Fund may be subject to statutory limits with respect to the amount it can invest in other ETFs, which may adversely affect the Fund’s ability to achieve its investment objective. Investments in ETFs are also subject to the “ETF Risks” described above. |
| AAM Crescent CLO ETF | Primary Market Issued Securities Risk Member | |
| Prospectus [Line Items] | |
| Risk [Text Block] | Primary Market Issued Securities Risk. The Fund may invest in primary market issued securities or “primaries.” Primaries may not be consistently available to the Fund for investing, particularly as the Fund’s asset base grows. Primaries may be volatile in price due to the absence of a prior trading market, limited quantities available, and an extended settlement period. During periods of higher price volatility, the Fund’s ability to acquire or dispose of CLOs at a price and time the Fund deems advantageous may be impaired. Primaries may be less liquid and have longer settlement periods than CLOs purchased on the secondary market. |
| AAM Crescent CLO ETF | Privately Issued Securities Risk Member | |
| Prospectus [Line Items] | |
| Risk [Text Block] | Privately Issued Securities Risk. CLO securities are generally privately-issued securities, and are normally purchased pursuant to Rule 144A or Regulation S under the Securities Act of 1933, as amended (the “Securities Act”). Privately-issued securities typically may be resold only to qualified institutional buyers, in a privately negotiated transaction, to a limited number of purchasers, or in limited quantities after they have been held for a specified period of time and other conditions are met for an exemption from registration. Because there may be relatively few potential purchasers for such securities, especially under adverse market or economic conditions or in the event of adverse changes in the financial condition of the issuer, the Fund may find markets for these securities are more thinly traded. At times, it also may be more difficult to determine the fair value of such securities for purposes of computing the Fund’s net asset value per share due to the absence of an active trading market. |
| AAM Crescent CLO ETF | Secondary Market Issued Securities Risk Member | |
| Prospectus [Line Items] | |
| Risk [Text Block] | Secondary Market Issued Securities Risk. The Fund may invest in secondary market issued securities. There is no guarantee that a secondary market will exist or be maintained for any given CLO security. The price of a CLO tranche in the secondary market can fluctuate based on supply and demand, credit quality, spreads, and market conditions and may trade above or below the price offered by the issuer in the primary market, which is typically based on a spread over a benchmark rate. In addition, CLOs purchased in the secondary market are subject to risks associated with the quality of the seller of the CLO tranche in addition to the quality of the CLO manager that issued the CLO tranche. |
| AAM Crescent CLO ETF | Valuation Risk Member | |
| Prospectus [Line Items] | |
| Risk [Text Block] | Valuation Risk. The CLO securities in which the Fund invests may be priced differently than the value realized upon such security’s sale. In times of market instability, valuation may be more unreliable. The tranches of certain CLOs may subject them to price volatility and enhanced liquidity and valuation risk in times of market stress. |
| AAM Crescent CLO ETF | Risk Lose Money [Member] | |
| Prospectus [Line Items] | |
| Risk [Text Block] | As with any investment, there is a risk that you could lose all or a portion of your investment in the Fund. |
| AAM Low Duration Preferred and Income Securities ETF | Dividend-Paying Securities Risk Member | |
| Prospectus [Line Items] | |
| Risk [Text Block] | Dividend-Paying Securities Risk. Investment in dividend-paying securities could cause the Fund to underperform similar funds that invest without consideration of a company’s track record of paying dividends. Securities of companies with a history of paying dividends may not participate in a broad market advance to the same degree as most other securities, and a sharp rise in interest rates or economic downturn could cause a company to unexpectedly reduce or eliminate its dividend. There is no guarantee that the issuers of the securities held by the Fund will declare dividends in the future or that, if declared, they will remain at their current levels or increase over time. |
| AAM Low Duration Preferred and Income Securities ETF | Equity Market Risk Member | |
| Prospectus [Line Items] | |
| Risk [Text Block] | Equity Market Risk. Equity securities, including preferred stocks, and hybrid securities that have equity characteristics may experience sudden, unpredictable drops in value or long periods of decline in value. This may occur because of factors that affect securities markets generally or factors affecting specific issuers, industries, sectors or companies in which the Fund invests. Preferred stocks and hybrid securities generally are subject to more risks than debt securities because stockholders’ claims are subordinated to those of holders of debt securities upon the bankruptcy of the issuer. In addition, local, regional or global events such as war, including Russia’s invasion of Ukraine, acts of terrorism, spread of infectious diseases or other public health issues (such as the global pandemic caused by the COVID-19 virus), recessions, or other events could have a significant negative impact on the Fund and its investments. Such events may affect certain geographic regions, countries, sectors and industries more significantly than others. Such events could adversely affect the prices and liquidity of the Fund’s portfolio securities or other instruments and could result in disruptions in the trading markets. |
| AAM Low Duration Preferred and Income Securities ETF | ETF Risks Member | |
| Prospectus [Line Items] | |
| Risk [Text Block] | •ETF Risks. The Fund is an exchange-traded fund (“ETF”), and, as a result of an ETF’s structure, it is exposed to the following risks: ◦Authorized Participants, Market Makers, and Liquidity Providers Concentration Risk. The Fund has a limited number of financial institutions that may act as Authorized Participants (“APs”). In addition, there may be a limited number of market makers and/or liquidity providers in the marketplace. To the extent either of the following events occur, Shares may trade at a material discount to NAV and possibly face delisting: (i) APs exit the business or otherwise become unable to process creation and/or redemption orders and no other APs step forward to perform these services, or (ii) market makers and/or liquidity providers exit the business or significantly reduce their business activities and no other entities step forward to perform their functions. ◦Costs of Buying or Selling Shares. Due to the costs of buying or selling Shares, including brokerage commissions imposed by brokers and bid-ask spreads, frequent trading of Shares may significantly reduce investment results and an investment in Shares may not be advisable for investors who anticipate regularly making small investments. ◦Shares May Trade at Prices Other Than NAV. As with all ETFs, Shares may be bought and sold in the secondary market at market prices. Although it is expected that the market price of Shares will approximate the Fund’s NAV, there may be times when the market price of Shares is more than the NAV intra-day (premium) or less than the NAV intra-day (discount) due to supply and demand of Shares or during periods of market volatility. This risk is heightened in times of market volatility, periods of steep market declines, and periods when there is limited trading activity for Shares in the secondary market, in which case such premiums or discounts may be significant. ◦Trading. Although Shares are listed for trading on the NYSE Arca, Inc. (the “Exchange”) and may be traded on U.S. exchanges other than the Exchange, there can be no assurance that Shares will trade with any volume, or at all, on any stock exchange. There can be no assurance that an active trading market for such Shares will develop or be maintained. In stressed market conditions, the liquidity of Shares may begin to mirror the liquidity of the Fund’s underlying portfolio holdings, which can be significantly less liquid than Shares, and this could lead to differences between the market price of the Shares and the underlying value of those Shares.
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| AAM Low Duration Preferred and Income Securities ETF | ETF Risks, Authorized Participants, Market Makers And Liquidity Providers Concentration Risk Member | |
| Prospectus [Line Items] | |
| Risk [Text Block] | Authorized Participants, Market Makers, and Liquidity Providers Concentration Risk. The Fund has a limited number of financial institutions that may act as Authorized Participants (“APs”). In addition, there may be a limited number of market makers and/or liquidity providers in the marketplace. To the extent either of the following events occur, Shares may trade at a material discount to NAV and possibly face delisting: (i) APs exit the business or otherwise become unable to process creation and/or redemption orders and no other APs step forward to perform these services, or (ii) market makers and/or liquidity providers exit the business or significantly reduce their business activities and no other entities step forward to perform their functions. |
| AAM Low Duration Preferred and Income Securities ETF | ETF Risks, Costs Of Buying Or Selling Shares Risk Member | |
| Prospectus [Line Items] | |
| Risk [Text Block] | Costs of Buying or Selling Shares. Due to the costs of buying or selling Shares, including brokerage commissions imposed by brokers and bid-ask spreads, frequent trading of Shares may significantly reduce investment results and an investment in Shares may not be advisable for investors who anticipate regularly making small investments. |
| AAM Low Duration Preferred and Income Securities ETF | ETF Risks, Shares May Trade At Prices Other Than NAV Risk Member | |
| Prospectus [Line Items] | |
| Risk [Text Block] | Shares May Trade at Prices Other Than NAV. As with all ETFs, Shares may be bought and sold in the secondary market at market prices. Although it is expected that the market price of Shares will approximate the Fund’s NAV, there may be times when the market price of Shares is more than the NAV intra-day (premium) or less than the NAV intra-day (discount) due to supply and demand of Shares or during periods of market volatility. This risk is heightened in times of market volatility, periods of steep market declines, and periods when there is limited trading activity for Shares in the secondary market, in which case such premiums or discounts may be significant. |
| AAM Low Duration Preferred and Income Securities ETF | ETF Risks, Trading Risk Member | |
| Prospectus [Line Items] | |
| Risk [Text Block] | Trading. Although Shares are listed for trading on the NYSE Arca, Inc. (the “Exchange”) and may be traded on U.S. exchanges other than the Exchange, there can be no assurance that Shares will trade with any volume, or at all, on any stock exchange. There can be no assurance that an active trading market for such Shares will develop or be maintained. In stressed market conditions, the liquidity of Shares may begin to mirror the liquidity of the Fund’s underlying portfolio holdings, which can be significantly less liquid than Shares, and this could lead to differences between the market price of the Shares and the underlying value of those Shares. |
| AAM Low Duration Preferred and Income Securities ETF | Market Capitalization Risk Member | |
| Prospectus [Line Items] | |
| Risk [Text Block] | Market Capitalization Risk. The securities of large-capitalization companies may be relatively mature compared to smaller companies and therefore subject to slower growth during times of economic expansion. The securities of mid-capitalization companies may be more vulnerable to adverse issuer, market, political, or economic developments than securities of large-capitalization companies. The securities of small-capitalization companies generally trade in lower volumes and are subject to greater and more unpredictable price changes than larger capitalization stocks or the stock market as a whole. |
| AAM Low Duration Preferred and Income Securities ETF | Sector Risk Member | |
| Prospectus [Line Items] | |
| Risk [Text Block] | •Sector Risk. To the extent the Fund invests more heavily in particular sectors of the economy, its performance will be especially sensitive to developments that significantly affect those sectors. ◦Financial Sector Risk. Companies in the financial sector may be significantly affected by changes in interest rates, government regulation, the rate of defaults on corporate, consumer and government debt, the availability and cost of capital, and fallout from the housing and sub-prime mortgage crisis. This sector has experienced significant losses in the recent past, and the impact of more stringent capital requirements and of recent or future regulation on any individual financial company or on the sector as a whole cannot be predicted. In recent years, cyber attacks and technology malfunctions and failures have become increasingly frequent in this sector and have caused significant losses.
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| AAM Low Duration Preferred and Income Securities ETF | Securities Lending Risk Member | |
| Prospectus [Line Items] | |
| Risk [Text Block] | Securities Lending Risk. The Fund may engage in securities lending. There are certain risks associated with securities lending, including the risk that the borrower may fail to return the securities on a timely basis or even the loss of rights in the collateral deposited by the borrower, if the borrower should fail financially. The Fund could also lose money in the event of a decline in the value of collateral provided for loaned securities or a decline in the value of any investments made with cash collateral. As a result, the Fund may lose money. |
| AAM Low Duration Preferred and Income Securities ETF | Call Risk 1 Member | |
| Prospectus [Line Items] | |
| Risk [Text Block] | Call Risk. During periods of falling interest rates, an issuer of a callable security held by the Fund may “call” or repay the security before its stated maturity, and the Fund may have to reinvest the proceeds at lower interest rates, resulting in a decline in the Fund’s income. |
| AAM Low Duration Preferred and Income Securities ETF | Cash Redemption Risk Member | |
| Prospectus [Line Items] | |
| Risk [Text Block] | Cash Redemption Risk. The Fund’s investment strategy may require it to redeem shares for cash or to otherwise include cash as part of its redemption proceeds. The Fund may be required to sell or unwind portfolio investments to obtain the cash needed to distribute redemption proceeds. This may cause the Fund to recognize a capital gain that it might not have recognized if it had made a redemption in-kind. As a result, the Fund may pay out higher annual capital gain distributions than if the in-kind redemption process was used. |
| AAM Low Duration Preferred and Income Securities ETF | Concentration Risk Member | |
| Prospectus [Line Items] | |
| Risk [Text Block] | Concentration Risk. The Fund’s investments will be concentrated in an industry or group of industries to the extent that the Index is so concentrated. In such event, the value of the Shares may rise and fall more than the value of shares of a fund that invests in securities of companies in a broader range of industries. |
| AAM Low Duration Preferred and Income Securities ETF | Credit Risk 1 Member | |
| Prospectus [Line Items] | |
| Risk [Text Block] | Credit Risk. Debt issuers and other counterparties may not honor their obligations or may have their debt downgraded by ratings agencies. Changes in an issuer’s credit rating or the market’s perception of an issuer’s creditworthiness may also adversely affect the value of the Fund’s investment in that issuer. |
| AAM Low Duration Preferred and Income Securities ETF | Depositary Receipt Risk Member | |
| Prospectus [Line Items] | |
| Risk [Text Block] | Depositary Receipt Risk. Depositary Receipts involve risks similar to those associated with investments in foreign securities, such as changes in political or economic conditions of other countries and changes in the exchange rates of foreign currencies. Depositary Receipts listed on U.S. exchanges are issued by banks or trust companies, and entitle the holder to all dividends and capital gains that are paid out on the underlying foreign shares (“Underlying Shares”). When the Fund invests in Depositary Receipts as a substitute for an investment directly in the Underlying Shares, the Fund is exposed to the risk that the Depositary Receipts may not provide a return that corresponds precisely with that of the Underlying Shares. |
| AAM Low Duration Preferred and Income Securities ETF | Extension Risk Member | |
| Prospectus [Line Items] | |
| Risk [Text Block] | Extension Risk. During periods of rising interest rates, certain debt obligations will be paid off substantially more slowly than originally anticipated and the value of those securities may fall sharply, resulting in a decline in the Fund’s income and potentially in the value of the Fund’s investments. |
| AAM Low Duration Preferred and Income Securities ETF | Foreign Markets Risk Member | |
| Prospectus [Line Items] | |
| Risk [Text Block] | Foreign Markets Risk. Investments in ADRs that provide exposure to non-U.S. securities involve certain risks that may not be present with investments in U.S. securities. For example, the value of non-U.S. securities may be subject to risk of decline due to foreign currency fluctuations or to political or economic instability. Investments in ADRs also may be subject to withholding or other taxes and may be indirectly subject to additional trading, settlement, custodial, and operational risks. These and other factors can make investments in the Fund more volatile and potentially less liquid than other types of investments. |
| AAM Low Duration Preferred and Income Securities ETF | High-Yield Securities Risk Member | |
| Prospectus [Line Items] | |
| Risk [Text Block] | High-Yield Securities Risk. High-yield securities (also known as “junk bonds”) carry a greater degree of risk and are considered speculative by the major credit rating agencies. High-yield securities may be issued by companies that are restructuring, are smaller and less creditworthy, or are more highly indebted than other companies. This means that they may have more difficulty making scheduled payments of principal and interest. Changes in the value of high-yield securities are influenced more by changes in the financial and business position of the issuing company than by changes in interest rates when compared to investment grade securities. High-yield securities have greater volatility because there is less certainty that principal and interest payments will be made as scheduled. The Fund’s investments in high-yield securities expose it to a substantial degree of credit risk. These investments are considered speculative under traditional investment standards. Prices of high-yield securities will rise and fall primarily in response to actual or perceived changes in the issuer's financial health, although changes in market interest rates also will affect prices. High-yield securities may experience reduced liquidity and sudden and substantial decreases in price. |
| AAM Low Duration Preferred and Income Securities ETF | Hybrid Securities Risk Member | |
| Prospectus [Line Items] | |
| Risk [Text Block] | Hybrid Securities Risk. Hybrid securities are subject to the risks of equity securities and debt securities. The claims of holders of hybrid securities of an issuer are generally subordinated to those of holders of traditional debt securities in bankruptcy, and thus hybrid securities may be more volatile and subject to greater risk than traditional debt securities, and may in certain circumstances even be more volatile than traditional equity securities. At the same time, hybrid securities may not fully participate in gains of their issuer and thus potential returns of such securities are generally more limited than traditional equity securities, which would participate in such gains. |
| AAM Low Duration Preferred and Income Securities ETF | Index Provider Risk Member | |
| Prospectus [Line Items] | |
| Risk [Text Block] | Index Provider Risk. There is no assurance that the Index Provider, or any agents that act on its behalf, will compile the Index accurately, or that the Index will be determined, maintained, constructed, reconstituted, rebalanced, composed, calculated or disseminated accurately. The Adviser relies upon the Index Provider and its agents to compile, determine, maintain, construct, reconstitute, rebalance, compose, calculate (or arrange for an agent to calculate), and disseminate the Index accurately. Any losses or costs associated with errors made by the Index Provider or its agents generally will be borne by the Fund and its shareholders. |
| AAM Low Duration Preferred and Income Securities ETF | Interest Rate Risk 1 Member | |
| Prospectus [Line Items] | |
| Risk [Text Block] | Interest Rate Risk. Generally, the value of fixed income securities, as well as hybrid securities with fixed income characteristics, will change inversely with changes in interest rates. An increase in interest rates may cause the value of fixed income securities and such hybrid securities to decline. Conversely, as interest rates fall, the market value of fixed income securities and such hybrid securities tend to increase. This risk will be greater for long-term securities than for short-term securities. |
| AAM Low Duration Preferred and Income Securities ETF | Issuer-Specific Risk Member | |
| Prospectus [Line Items] | |
| Risk [Text Block] | Issuer-Specific Risk. Issuer-specific events, including changes in the financial condition of an issuer, can have a negative impact on the value of the Fund. |
| AAM Low Duration Preferred and Income Securities ETF | Passive Investment Risk Member | |
| Prospectus [Line Items] | |
| Risk [Text Block] | Passive Investment Risk. The Fund is not actively managed, and its sub-adviser would not sell shares of an equity security due to current or projected underperformance of a security, industry, or sector, unless that security is removed from the Index or the selling of shares of that security is otherwise required upon a reconstitution or rebalancing of the Index in accordance with the Index methodology. |
| AAM Low Duration Preferred and Income Securities ETF | Portfolio Turnover Risk Member | |
| Prospectus [Line Items] | |
| Risk [Text Block] | Portfolio Turnover Risk. The Fund may trade all or a significant portion of the securities in its portfolio in connection with each rebalance and reconstitution of its Index. A high portfolio turnover rate increases transaction costs, which may increase the Fund’s expenses. Frequent trading may also cause adverse tax consequences for investors in the Fund due to an increase in short-term capital gains. |
| AAM Low Duration Preferred and Income Securities ETF | Preferred Securities Risk Member | |
| Prospectus [Line Items] | |
| Risk [Text Block] | Preferred Securities Risk. Preferred stocks are subject to the risks of equity securities generally and also risks associated with fixed income securities, such as interest rate risk. A company’s preferred stock generally pays dividends only after the company makes required payments to creditors. As a result, the value of a company’s preferred stock will react more strongly than bonds and other debt to actual or perceived changes in the company’s financial condition or prospects. Preferred stock may be less liquid than many other types of securities, such as common stock, and generally has limited or no voting rights. In addition, preferred stock is subject to the risks that a company may defer or not pay dividends, and, in certain situations, may call or redeem its preferred stock or convert it to common stock. Non-listed preferred stock are not traded on an exchange; rather, such securities are bought and sold via the over-the-counter (OTC) market through a broker-dealer or private transaction. As a result, OTC-traded preferred stocks may be less liquid investments than exchange-traded preferred securities. In addition, non-listed preferred stocks are not subject to the same listing requirements as listed securities and may be less transparent with respect to pricing, trade, volume, and liquidity.
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| AAM Low Duration Preferred and Income Securities ETF | Prepayment Risk 1 Member | |
| Prospectus [Line Items] | |
| Risk [Text Block] | Prepayment Risk. This is the risk that a borrower will prepay some or the entire principal owed to the Fund. If that happens, the Fund may have to replace the security by investing the proceeds in a security with a lower yield. This could reduce the share price and income distributions of the Fund. |
| AAM Low Duration Preferred and Income Securities ETF | REIT Investment Risk Member | |
| Prospectus [Line Items] | |
| Risk [Text Block] | REIT Investment Risk. Investments in REITs involve unique risks. REITs may have limited financial resources, may trade less frequently and in limited volume, and may be more volatile than other securities. REITs may be affected by changes in the value of their underlying properties or mortgages or by defaults by their borrowers or tenants. Furthermore, these entities depend upon specialized management skills, have limited diversification and are, therefore, subject to risks inherent in financing a limited number of projects. In addition, the performance of a REIT may be affected by changes in the tax laws or by its failure to qualify for tax-free pass-through of income. |
| AAM Low Duration Preferred and Income Securities ETF | Sector Risk, Financial Sector Risk Member | |
| Prospectus [Line Items] | |
| Risk [Text Block] | Financial Sector Risk. Companies in the financial sector may be significantly affected by changes in interest rates, government regulation, the rate of defaults on corporate, consumer and government debt, the availability and cost of capital, and fallout from the housing and sub-prime mortgage crisis. This sector has experienced significant losses in the recent past, and the impact of more stringent capital requirements and of recent or future regulation on any individual financial company or on the sector as a whole cannot be predicted. In recent years, cyber attacks and technology malfunctions and failures have become increasingly frequent in this sector and have caused significant losses. |
| AAM Low Duration Preferred and Income Securities ETF | Tracking Error Risk Member | |
| Prospectus [Line Items] | |
| Risk [Text Block] | Tracking Error Risk. As with all index funds, the performance of the Fund and the Index may vary somewhat for a variety of reasons. For example, the Fund incurs operating expenses and portfolio transaction costs not incurred by the Index. In addition, the Fund may not be fully invested in the securities of the Index at all times or may hold securities not included in the Index. |
| AAM Low Duration Preferred and Income Securities ETF | Risk Lose Money [Member] | |
| Prospectus [Line Items] | |
| Risk [Text Block] | As with any investment, there is a risk that you could lose all or a portion of your investment in the Fund. |
| AAM S&P 500 High Dividend Value ETF | Equity Market Risk Member | |
| Prospectus [Line Items] | |
| Risk [Text Block] | Equity Market Risk. The equity securities held in the Fund’s portfolio may experience sudden, unpredictable drops in value or long periods of decline in value. This may occur because of factors that affect securities markets generally or factors affecting specific issuers, industries, or sectors in which the Fund invests. Common stocks are generally exposed to greater risk than other types of securities, such as preferred stock and debt obligations, because common stockholders generally have inferior rights to receive payment from issuers. In addition, local, regional or global events such as war, including Russia’s invasion of Ukraine, acts of terrorism, spread of infectious diseases or other public health issues (such as the global pandemic caused by the COVID-19 virus), recessions, rising inflation, trade wars and tariffs, or other events could have a significant negative impact on the Fund and its investments. Such events may affect certain geographic regions, countries, sectors and industries more significantly than others. Such events could adversely affect the prices and liquidity of the Fund’s portfolio securities or other instruments and could result in disruptions in the trading markets. |
| AAM S&P 500 High Dividend Value ETF | ETF Risks Member | |
| Prospectus [Line Items] | |
| Risk [Text Block] | ETF Risks. The Fund is an exchange-traded fund (“ETF”), and, as a result of an ETF’s structure, it is exposed to the following risks: ◦Authorized Participants, Market Makers, and Liquidity Providers Concentration Risk. The Fund has a limited number of financial institutions that may act as Authorized Participants (“APs”). In addition, there may be a limited number of market makers and/or liquidity providers in the marketplace. To the extent either of the following events occur, Shares may trade at a material discount to NAV and possibly face delisting: (i) APs exit the business or otherwise become unable to process creation and/or redemption orders and no other APs step forward to perform these services, or (ii) market makers and/or liquidity providers exit the business or significantly reduce their business activities and no other entities step forward to perform their functions. ◦Costs of Buying or Selling Shares. Due to the costs of buying or selling Shares, including brokerage commissions imposed by brokers and bid-ask spreads, frequent trading of Shares may significantly reduce investment results and an investment in Shares may not be advisable for investors who anticipate regularly making small investments. ◦Shares May Trade at Prices Other Than NAV. As with all ETFs, Shares may be bought and sold in the secondary market at market prices. Although it is expected that the market price of Shares will approximate the Fund’s NAV, there may be times when the market price of Shares is more than the NAV intra-day (premium) or less than the NAV intra-day (discount) due to supply and demand of Shares or during periods of market volatility. This risk is heightened in times of market volatility, periods of steep market declines, and periods when there is limited trading activity for Shares in the secondary market, in which case such premiums or discounts may be significant. ◦Trading. Although Shares are listed for trading on NYSE Arca, Inc. (the “Exchange”) and may be traded on U.S. exchanges other than the Exchange, there can be no assurance that Shares will trade with any volume, or at all, on any stock exchange. There can be no assurance that an active trading market for such Shares will develop or be maintained. In stressed market conditions, the liquidity of Shares may begin to mirror the liquidity of the Fund’s underlying portfolio holdings, which can be significantly less liquid than Shares, and this could lead to differences between the market price of the Shares and the underlying value of those Shares.
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| AAM S&P 500 High Dividend Value ETF | ETF Risks, Authorized Participants, Market Makers And Liquidity Providers Concentration Risk Member | |
| Prospectus [Line Items] | |
| Risk [Text Block] | Authorized Participants, Market Makers, and Liquidity Providers Concentration Risk. The Fund has a limited number of financial institutions that may act as Authorized Participants (“APs”). In addition, there may be a limited number of market makers and/or liquidity providers in the marketplace. To the extent either of the following events occur, Shares may trade at a material discount to NAV and possibly face delisting: (i) APs exit the business or otherwise become unable to process creation and/or redemption orders and no other APs step forward to perform these services, or (ii) market makers and/or liquidity providers exit the business or significantly reduce their business activities and no other entities step forward to perform their functions. |
| AAM S&P 500 High Dividend Value ETF | ETF Risks, Costs Of Buying Or Selling Shares Risk Member | |
| Prospectus [Line Items] | |
| Risk [Text Block] | Costs of Buying or Selling Shares. Due to the costs of buying or selling Shares, including brokerage commissions imposed by brokers and bid-ask spreads, frequent trading of Shares may significantly reduce investment results and an investment in Shares may not be advisable for investors who anticipate regularly making small investments. |
| AAM S&P 500 High Dividend Value ETF | ETF Risks, Shares May Trade At Prices Other Than NAV Risk Member | |
| Prospectus [Line Items] | |
| Risk [Text Block] | Shares May Trade at Prices Other Than NAV. As with all ETFs, Shares may be bought and sold in the secondary market at market prices. Although it is expected that the market price of Shares will approximate the Fund’s NAV, there may be times when the market price of Shares is more than the NAV intra-day (premium) or less than the NAV intra-day (discount) due to supply and demand of Shares or during periods of market volatility. This risk is heightened in times of market volatility, periods of steep market declines, and periods when there is limited trading activity for Shares in the secondary market, in which case such premiums or discounts may be significant. |
| AAM S&P 500 High Dividend Value ETF | ETF Risks, Trading Risk Member | |
| Prospectus [Line Items] | |
| Risk [Text Block] | Trading. Although Shares are listed for trading on NYSE Arca, Inc. (the “Exchange”) and may be traded on U.S. exchanges other than the Exchange, there can be no assurance that Shares will trade with any volume, or at all, on any stock exchange. There can be no assurance that an active trading market for such Shares will develop or be maintained. In stressed market conditions, the liquidity of Shares may begin to mirror the liquidity of the Fund’s underlying portfolio holdings, which can be significantly less liquid than Shares, and this could lead to differences between the market price of the Shares and the underlying value of those Shares. |
| AAM S&P 500 High Dividend Value ETF | Market Capitalization Risk Member | |
| Prospectus [Line Items] | |
| Risk [Text Block] | Market Capitalization Risk. ◦Large-Capitalization Investing Risk. The securities of large-capitalization companies may be relatively mature compared to smaller companies and therefore subject to slower growth during times of economic expansion. Large-capitalization companies may also be unable to respond quickly to new competitive challenges, such as changes in technology and consumer tastes. |
| AAM S&P 500 High Dividend Value ETF | Market Capitalization Risk, Large-Capitalization Investing Risk Member | |
| Prospectus [Line Items] | |
| Risk [Text Block] | Large-Capitalization Investing Risk. The securities of large-capitalization companies may be relatively mature compared to smaller companies and therefore subject to slower growth during times of economic expansion. Large-capitalization companies may also be unable to respond quickly to new competitive challenges, such as changes in technology and consumer tastes. |
| AAM S&P 500 High Dividend Value ETF | Concentration Risk Member | |
| Prospectus [Line Items] | |
| Risk [Text Block] | Concentration Risk. The Fund’s investments will be concentrated in an industry or group of industries to the extent that the Index is so concentrated. In such event, the value of the Shares may rise and fall more than the value of shares of a fund that invests in securities of companies in a broader range of industries. |
| AAM S&P 500 High Dividend Value ETF | Index Provider Risk Member | |
| Prospectus [Line Items] | |
| Risk [Text Block] | Index Provider Risk. There is no assurance that the Index Provider, or any agents that act on its behalf, will compile the Index accurately, or that the Index will be determined, maintained, constructed, reconstituted, rebalanced, composed, calculated or disseminated accurately. The Adviser relies upon the Index Provider and its agents to compile, determine, maintain, construct, reconstitute, rebalance, compose, calculate (or arrange for an agent to calculate), and disseminate the Index accurately. Any losses or costs associated with errors made by the Index Provider or its agents generally will be borne by the Fund and its shareholders. |
| AAM S&P 500 High Dividend Value ETF | Passive Investment Risk Member | |
| Prospectus [Line Items] | |
| Risk [Text Block] | Passive Investment Risk. The Fund is not actively managed, and its sub-adviser would not sell shares of an equity security due to current or projected underperformance of a security, industry, or sector, unless that security is removed from the Index or the selling of shares of that security is otherwise required upon a reconstitution or rebalancing of the Index in accordance with the Index methodology. |
| AAM S&P 500 High Dividend Value ETF | REIT Investment Risk Member | |
| Prospectus [Line Items] | |
| Risk [Text Block] | REIT Investment Risk. Investments in REITs involve unique risks. REITs may have limited financial resources, may trade less frequently and in limited volume, and may be more volatile than other securities. REITs may be affected by changes in the value of their underlying properties or mortgages or by defaults by their borrowers or tenants. Furthermore, these entities depend upon specialized management skills, have limited diversification and are, therefore, subject to risks inherent in financing a limited number of projects. In addition, the performance of a U.S. REIT may be affected by changes in the tax laws or by its failure to qualify for tax-free pass-through of income. •Securities Lending Risk. The Fund may engage in securities lending. There are certain risks associated with securities lending, including the risk that the borrower may fail to return the securities on a timely basis or even the loss of rights in the collateral deposited by the borrower, if the borrower should fail financially. The Fund could also lose money in the event of a decline in the value of collateral provided for loaned securities or a decline in the value of any investments made with cash collateral. As a result, the Fund may lose money.
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| AAM S&P 500 High Dividend Value ETF | Tracking Error Risk Member | |
| Prospectus [Line Items] | |
| Risk [Text Block] | Tracking Error Risk. As with all index funds, the performance of the Fund and the Index may differ from each other for a variety of reasons. For example, the Fund incurs operating expenses and portfolio transaction costs not incurred by the Index. In addition, the Fund may not be fully invested in the securities of the Index at all times or may hold securities not included in the Index. |
| AAM S&P 500 High Dividend Value ETF | High Dividend Investing Risk Member | |
| Prospectus [Line Items] | |
| Risk [Text Block] | High Dividend Investing Risk. Companies with a high yield or payout ratio may reduce their dividend or stop paying dividends entirely while they are included in the Index. Such events could lower the price or yield of such company’s equity securities. Additionally, equity securities with a high yield or payout ratio may underperform other securities in certain market conditions. |
| AAM S&P 500 High Dividend Value ETF | Risk Lose Money [Member] | |
| Prospectus [Line Items] | |
| Risk [Text Block] | As with any investment, there is a risk that you could lose all or a portion of your investment in the Fund. |
| AAM SAWGRASS U.S. LARGE CAP QUALITY GROWTH ETF | Equity Market Risk Member | |
| Prospectus [Line Items] | |
| Risk [Text Block] | Equity Market Risk. The equity securities held in the Fund’s portfolio may experience sudden, unpredictable drops in value or long periods of decline in value. This may occur because of factors that affect securities markets generally or factors affecting specific issuers, industries, or sectors in which the Fund invests. Common stocks are generally exposed to greater risk than other types of securities, such as preferred stock and debt obligations, because common stockholders generally have inferior rights to receive payment from issuers. In addition, local, regional or global events such as war, including Russia’s invasion of Ukraine, acts of terrorism, spread of infectious diseases or other public health issues (such as the global pandemic caused by the COVID-19 virus), recessions, rising inflation, trade wars and tariffs, or other events could have a significant negative impact on the Fund and its investments. Such events may affect certain geographic regions, countries, sectors and industries more significantly than others. Such events could adversely affect the prices and liquidity of the Fund’s portfolio securities or other instruments and could result in disruptions in the trading markets. |
| AAM SAWGRASS U.S. LARGE CAP QUALITY GROWTH ETF | ETF Risks Member | |
| Prospectus [Line Items] | |
| Risk [Text Block] | ETF Risks. The Fund is an ETF, and, as a result of an ETF’s structure, it is exposed to the following risks: ◦Authorized Participants, Market Makers, and Liquidity Providers Concentration Risk. The Fund has a limited number of financial institutions that may act as Authorized Participants (“APs”). In addition, there may be a limited number of market makers and/or liquidity providers in the marketplace. To the extent either of the following events occur, Shares may trade at a material discount to NAV and possibly face delisting: (i) APs exit the business or otherwise become unable to process creation and/or redemption orders and no other APs step forward to perform these services, or (ii) market makers and/or liquidity providers exit the business or significantly reduce their business activities and no other entities step forward to perform their functions. ◦Costs of Buying or Selling Shares. Due to the costs of buying or selling Shares, including brokerage commissions imposed by brokers and bid-ask spreads, frequent trading of Shares may significantly reduce investment results and an investment in Shares may not be advisable for investors who anticipate regularly making small investments. ◦Shares May Trade at Prices Other Than NAV. As with all ETFs, Shares may be bought and sold in the secondary market at market prices. Although it is expected that the market price of Shares will approximate the Fund’s NAV, there may be times when the market price of Shares is more than the NAV intra-day (premium) or less than the NAV intra-day (discount) due to supply and demand of Shares or during periods of market volatility. This risk is heightened in times of market volatility, periods of steep market declines, and periods when there is limited trading activity for Shares in the secondary market, in which case such premiums or discounts may be significant. ◦Trading. Although Shares are listed for trading on NYSE Arca, Inc. (the “Exchange”) and may be traded on U.S. exchanges other than the Exchange, there can be no assurance that Shares will trade with any volume, or at all, on any stock exchange. There can be no assurance that an active trading market for such Shares will develop or be maintained. In stressed market conditions, the liquidity of Shares may begin to mirror the liquidity of the Fund’s underlying portfolio holdings, which can be significantly less liquid than Shares, and this could lead to differences between the market price of the Shares and the underlying value of those Shares.
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| AAM SAWGRASS U.S. LARGE CAP QUALITY GROWTH ETF | ETF Risks, Authorized Participants, Market Makers And Liquidity Providers Concentration Risk Member | |
| Prospectus [Line Items] | |
| Risk [Text Block] | Authorized Participants, Market Makers, and Liquidity Providers Concentration Risk. The Fund has a limited number of financial institutions that may act as Authorized Participants (“APs”). In addition, there may be a limited number of market makers and/or liquidity providers in the marketplace. To the extent either of the following events occur, Shares may trade at a material discount to NAV and possibly face delisting: (i) APs exit the business or otherwise become unable to process creation and/or redemption orders and no other APs step forward to perform these services, or (ii) market makers and/or liquidity providers exit the business or significantly reduce their business activities and no other entities step forward to perform their functions. |
| AAM SAWGRASS U.S. LARGE CAP QUALITY GROWTH ETF | ETF Risks, Costs Of Buying Or Selling Shares Risk Member | |
| Prospectus [Line Items] | |
| Risk [Text Block] | Costs of Buying or Selling Shares. Due to the costs of buying or selling Shares, including brokerage commissions imposed by brokers and bid-ask spreads, frequent trading of Shares may significantly reduce investment results and an investment in Shares may not be advisable for investors who anticipate regularly making small investments. |
| AAM SAWGRASS U.S. LARGE CAP QUALITY GROWTH ETF | ETF Risks, Shares May Trade At Prices Other Than NAV Risk Member | |
| Prospectus [Line Items] | |
| Risk [Text Block] | Shares May Trade at Prices Other Than NAV. As with all ETFs, Shares may be bought and sold in the secondary market at market prices. Although it is expected that the market price of Shares will approximate the Fund’s NAV, there may be times when the market price of Shares is more than the NAV intra-day (premium) or less than the NAV intra-day (discount) due to supply and demand of Shares or during periods of market volatility. This risk is heightened in times of market volatility, periods of steep market declines, and periods when there is limited trading activity for Shares in the secondary market, in which case such premiums or discounts may be significant. |
| AAM SAWGRASS U.S. LARGE CAP QUALITY GROWTH ETF | ETF Risks, Trading Risk Member | |
| Prospectus [Line Items] | |
| Risk [Text Block] | Trading. Although Shares are listed for trading on NYSE Arca, Inc. (the “Exchange”) and may be traded on U.S. exchanges other than the Exchange, there can be no assurance that Shares will trade with any volume, or at all, on any stock exchange. There can be no assurance that an active trading market for such Shares will develop or be maintained. In stressed market conditions, the liquidity of Shares may begin to mirror the liquidity of the Fund’s underlying portfolio holdings, which can be significantly less liquid than Shares, and this could lead to differences between the market price of the Shares and the underlying value of those Shares. |
| AAM SAWGRASS U.S. LARGE CAP QUALITY GROWTH ETF | Management Risk Member | |
| Prospectus [Line Items] | |
| Risk [Text Block] | Management Risk. The Fund is actively managed and may not meet its investment objective based on the Adviser’s success or failure to implement investment strategies for the Fund. |
| AAM SAWGRASS U.S. LARGE CAP QUALITY GROWTH ETF | Market Capitalization Risk Member | |
| Prospectus [Line Items] | |
| Risk [Text Block] | Market Capitalization Risk. ◦Large-Capitalization Investing Risk. The securities of large-capitalization companies may be relatively mature compared to smaller companies and therefore subject to slower growth during times of economic expansion. Large-capitalization companies may also be unable to respond quickly to new competitive challenges, such as changes in technology and consumer tastes. |
| AAM SAWGRASS U.S. LARGE CAP QUALITY GROWTH ETF | Market Capitalization Risk, Large-Capitalization Investing Risk Member | |
| Prospectus [Line Items] | |
| Risk [Text Block] | Large-Capitalization Investing Risk. The securities of large-capitalization companies may be relatively mature compared to smaller companies and therefore subject to slower growth during times of economic expansion. Large-capitalization companies may also be unable to respond quickly to new competitive challenges, such as changes in technology and consumer tastes. |
| AAM SAWGRASS U.S. LARGE CAP QUALITY GROWTH ETF | Sector Risk Member | |
| Prospectus [Line Items] | |
| Risk [Text Block] | •Sector Risk. To the extent the Fund invests more heavily in particular sectors of the economy, its performance will be especially sensitive to developments that significantly affect those sectors. The Fund may invest a significant portion of its assets in the following sectors and, therefore, the performance of the Fund could be negatively impacted by events affecting each of these sectors. ◦Information Technology Sector Risk. Market or economic factors impacting information technology companies and companies that rely heavily on technological advances could have a significant effect on the value of the Fund’s investments. The value of stocks of information technology companies and companies that rely heavily on technology is particularly vulnerable to rapid changes in technology product cycles, rapid product obsolescence, government regulation and competition, both domestically and internationally, including competition from foreign competitors with lower production costs. Stocks of information technology companies and companies that rely heavily on technology, especially those of smaller, less-seasoned companies, tend to be more volatile than the overall market. Information technology companies are heavily dependent on patent and intellectual property rights, the loss or impairment of which may adversely affect profitability.
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| AAM SAWGRASS U.S. LARGE CAP QUALITY GROWTH ETF | Sector Risk, Information Technology Sector Risk Member | |
| Prospectus [Line Items] | |
| Risk [Text Block] | Information Technology Sector Risk. Market or economic factors impacting information technology companies and companies that rely heavily on technological advances could have a significant effect on the value of the Fund’s investments. The value of stocks of information technology companies and companies that rely heavily on technology is particularly vulnerable to rapid changes in technology product cycles, rapid product obsolescence, government regulation and competition, both domestically and internationally, including competition from foreign competitors with lower production costs. Stocks of information technology companies and companies that rely heavily on technology, especially those of smaller, less-seasoned companies, tend to be more volatile than the overall market. Information technology companies are heavily dependent on patent and intellectual property rights, the loss or impairment of which may adversely affect profitability. |
| AAM SAWGRASS U.S. LARGE CAP QUALITY GROWTH ETF | Securities Lending Risk Member | |
| Prospectus [Line Items] | |
| Risk [Text Block] | Securities Lending Risk. The Fund may engage in securities lending. There are certain risks associated with securities lending, including the risk that the borrower may fail to return the securities on a timely basis or even the loss of rights in the collateral deposited by the borrower, if the borrower should fail financially. The Fund could also lose money in the event of a decline in the value of collateral provided for loaned securities or a decline in the value of any investments made with cash collateral. As a result, the Fund may lose money. |
| AAM SAWGRASS U.S. LARGE CAP QUALITY GROWTH ETF | Growth Investing Risk Member | |
| Prospectus [Line Items] | |
| Risk [Text Block] | Growth Investing Risk. Growth stocks may be more sensitive to market movements than other types of stocks because their prices are based largely on future expectations with respect to the stock’s issuer, its sector, and/or the overall economy. As a result, growth stocks may underperform value stocks or the overall equity market over a given period of time. |
| AAM SAWGRASS U.S. LARGE CAP QUALITY GROWTH ETF | Risk Lose Money [Member] | |
| Prospectus [Line Items] | |
| Risk [Text Block] | As with any investment, there is a risk that you could lose all or a portion of your investment in the Fund. |
| AAM SAWGRASS U.S. SMALL CAP QUALITY GROWTH ETF | Equity Market Risk Member | |
| Prospectus [Line Items] | |
| Risk [Text Block] | Equity Market Risk. The equity securities held in the Fund’s portfolio may experience sudden, unpredictable drops in value or long periods of decline in value. This may occur because of factors that affect securities markets generally or factors affecting specific issuers, industries, or sectors in which the Fund invests. Common stocks are generally exposed to greater risk than other types of securities, such as preferred stock and debt obligations, because common stockholders generally have inferior rights to receive payment from issuers. In addition, local, regional or global events such as war, including Russia’s invasion of Ukraine, acts of terrorism, spread of infectious diseases or other public health issues (such as the global pandemic caused by the COVID-19 virus), recessions, rising inflation, trade wars and tariffs, or other events could have a significant negative impact on the Fund and its investments. Such events may affect certain geographic regions, countries, sectors and industries more significantly than others. Such events could adversely affect the prices and liquidity of the Fund’s portfolio securities or other instruments and could result in disruptions in the trading markets. |
| AAM SAWGRASS U.S. SMALL CAP QUALITY GROWTH ETF | ETF Risks Member | |
| Prospectus [Line Items] | |
| Risk [Text Block] | ETF Risks. The Fund is an ETF, and, as a result of an ETF’s structure, it is exposed to the following risks: ◦Authorized Participants, Market Makers, and Liquidity Providers Concentration Risk. The Fund has a limited number of financial institutions that may act as Authorized Participants (“APs”). In addition, there may be a limited number of market makers and/or liquidity providers in the marketplace. To the extent either of the following events occur, Shares may trade at a material discount to NAV and possibly face delisting: (i) APs exit the business or otherwise become unable to process creation and/or redemption orders and no other APs step forward to perform these services, or (ii) market makers and/or liquidity providers exit the business or significantly reduce their business activities and no other entities step forward to perform their functions. ◦Costs of Buying or Selling Shares. Due to the costs of buying or selling Shares, including brokerage commissions imposed by brokers and bid-ask spreads, frequent trading of Shares may significantly reduce investment results and an investment in Shares may not be advisable for investors who anticipate regularly making small investments. ◦Shares May Trade at Prices Other Than NAV. As with all ETFs, Shares may be bought and sold in the secondary market at market prices. Although it is expected that the market price of Shares will approximate the Fund’s NAV, there may be times when the market price of Shares is more than the NAV intra-day (premium) or less than the NAV intra-day (discount) due to supply and demand of Shares or during periods of market volatility. This risk is heightened in times of market volatility, periods of steep market declines, and periods when there is limited trading activity for Shares in the secondary market, in which case such premiums or discounts may be significant. ◦Trading. Although Shares are listed for trading on NYSE Arca, Inc. (the “Exchange”) and may be traded on U.S. exchanges other than the Exchange, there can be no assurance that Shares will trade with any volume, or at all, on any stock exchange. There can be no assurance that an active trading market for such Shares will develop or be maintained. In stressed market conditions, the liquidity of Shares may begin to mirror the liquidity of the Fund’s underlying portfolio holdings, which can be significantly less liquid than Shares, and this could lead to differences between the market price of the Shares and the underlying value of those Shares.
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| AAM SAWGRASS U.S. SMALL CAP QUALITY GROWTH ETF | ETF Risks, Authorized Participants, Market Makers And Liquidity Providers Concentration Risk Member | |
| Prospectus [Line Items] | |
| Risk [Text Block] | Authorized Participants, Market Makers, and Liquidity Providers Concentration Risk. The Fund has a limited number of financial institutions that may act as Authorized Participants (“APs”). In addition, there may be a limited number of market makers and/or liquidity providers in the marketplace. To the extent either of the following events occur, Shares may trade at a material discount to NAV and possibly face delisting: (i) APs exit the business or otherwise become unable to process creation and/or redemption orders and no other APs step forward to perform these services, or (ii) market makers and/or liquidity providers exit the business or significantly reduce their business activities and no other entities step forward to perform their functions. |
| AAM SAWGRASS U.S. SMALL CAP QUALITY GROWTH ETF | ETF Risks, Costs Of Buying Or Selling Shares Risk Member | |
| Prospectus [Line Items] | |
| Risk [Text Block] | Costs of Buying or Selling Shares. Due to the costs of buying or selling Shares, including brokerage commissions imposed by brokers and bid-ask spreads, frequent trading of Shares may significantly reduce investment results and an investment in Shares may not be advisable for investors who anticipate regularly making small investments. |
| AAM SAWGRASS U.S. SMALL CAP QUALITY GROWTH ETF | ETF Risks, Shares May Trade At Prices Other Than NAV Risk Member | |
| Prospectus [Line Items] | |
| Risk [Text Block] | Shares May Trade at Prices Other Than NAV. As with all ETFs, Shares may be bought and sold in the secondary market at market prices. Although it is expected that the market price of Shares will approximate the Fund’s NAV, there may be times when the market price of Shares is more than the NAV intra-day (premium) or less than the NAV intra-day (discount) due to supply and demand of Shares or during periods of market volatility. This risk is heightened in times of market volatility, periods of steep market declines, and periods when there is limited trading activity for Shares in the secondary market, in which case such premiums or discounts may be significant. |
| AAM SAWGRASS U.S. SMALL CAP QUALITY GROWTH ETF | ETF Risks, Trading Risk Member | |
| Prospectus [Line Items] | |
| Risk [Text Block] | Trading. Although Shares are listed for trading on NYSE Arca, Inc. (the “Exchange”) and may be traded on U.S. exchanges other than the Exchange, there can be no assurance that Shares will trade with any volume, or at all, on any stock exchange. There can be no assurance that an active trading market for such Shares will develop or be maintained. In stressed market conditions, the liquidity of Shares may begin to mirror the liquidity of the Fund’s underlying portfolio holdings, which can be significantly less liquid than Shares, and this could lead to differences between the market price of the Shares and the underlying value of those Shares. |
| AAM SAWGRASS U.S. SMALL CAP QUALITY GROWTH ETF | Management Risk Member | |
| Prospectus [Line Items] | |
| Risk [Text Block] | Management Risk. The Fund is actively managed and may not meet its investment objective based on the Adviser’s success or failure to implement investment strategies for the Fund. |
| AAM SAWGRASS U.S. SMALL CAP QUALITY GROWTH ETF | Market Capitalization Risk Member | |
| Prospectus [Line Items] | |
| Risk [Text Block] | •Market Capitalization Risk. ◦Small-Capitalization Investing Risk. The securities of small-capitalization companies may be more vulnerable to adverse issuer, market, political, or economic developments than securities of larger-capitalization companies. The securities of small-capitalization companies generally trade in lower volumes and are subject to greater and more unpredictable price changes than larger capitalization stocks or the stock market as a whole. Small-capitalization companies also may be particularly sensitive to changes in interest rates, government regulation, borrowing costs and earnings.
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| AAM SAWGRASS U.S. SMALL CAP QUALITY GROWTH ETF | Sector Risk Member | |
| Prospectus [Line Items] | |
| Risk [Text Block] | Sector Risk. To the extent the Fund invests more heavily in particular sectors of the economy, its performance will be especially sensitive to developments that significantly affect those sectors. The Fund may invest a significant portion of its assets in the following sectors and, therefore, the performance of the Fund could be negatively impacted by events affecting each of these sectors. ◦Industrials Sector Risk. The industrials sector can be significantly affected by, among other things, worldwide economic growth, supply and demand for specific products and services, rapid technological developments, international political and economic developments, environmental issues, tariffs and trade barriers, and tax and governmental regulatory policies. As the demand for, or prices of, industrials increase, the value of the Fund’s investments generally would be expected to also increase. Conversely, declines in the demand for, or prices of, industrials generally would be expected to contribute to declines in the value of such securities. Such declines may occur quickly and without warning and may negatively impact the value of the Fund and your investment. ◦Health Care Sector Risk. Companies in the health care sector are subject to extensive government regulation and their profitability can be significantly affected by restrictions on government reimbursement for medical expenses, rising costs of medical products and services, pricing pressure (including price discounting), limited product lines, an increased emphasis on the delivery of healthcare through outpatient services, loss or impairment of intellectual property rights and litigation regarding product or service liability. ◦Information Technology Sector Risk. Market or economic factors impacting information technology companies and companies that rely heavily on technological advances could have a significant effect on the value of the Fund’s investments. The value of stocks of information technology companies and companies that rely heavily on technology is particularly vulnerable to rapid changes in technology product cycles, rapid product obsolescence, government regulation and competition, both domestically and internationally, including competition from foreign competitors with lower production costs. Stocks of information technology companies and companies that rely heavily on technology, especially those of smaller, less-seasoned companies, tend to be more volatile than the overall market. Information technology companies are heavily dependent on patent and intellectual property rights, the loss or impairment of which may adversely affect profitability.
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| AAM SAWGRASS U.S. SMALL CAP QUALITY GROWTH ETF | Sector Risk, Information Technology Sector Risk Member | |
| Prospectus [Line Items] | |
| Risk [Text Block] | Information Technology Sector Risk. Market or economic factors impacting information technology companies and companies that rely heavily on technological advances could have a significant effect on the value of the Fund’s investments. The value of stocks of information technology companies and companies that rely heavily on technology is particularly vulnerable to rapid changes in technology product cycles, rapid product obsolescence, government regulation and competition, both domestically and internationally, including competition from foreign competitors with lower production costs. Stocks of information technology companies and companies that rely heavily on technology, especially those of smaller, less-seasoned companies, tend to be more volatile than the overall market. Information technology companies are heavily dependent on patent and intellectual property rights, the loss or impairment of which may adversely affect profitability. |
| AAM SAWGRASS U.S. SMALL CAP QUALITY GROWTH ETF | Securities Lending Risk Member | |
| Prospectus [Line Items] | |
| Risk [Text Block] | Securities Lending Risk. The Fund may engage in securities lending. There are certain risks associated with securities lending, including the risk that the borrower may fail to return the securities on a timely basis or even the loss of rights in the collateral deposited by the borrower, if the borrower should fail financially. The Fund could also lose money in the event of a decline in the value of collateral provided for loaned securities or a decline in the value of any investments made with cash collateral. As a result, the Fund may lose money. |
| AAM SAWGRASS U.S. SMALL CAP QUALITY GROWTH ETF | Growth Investing Risk Member | |
| Prospectus [Line Items] | |
| Risk [Text Block] | Growth Investing Risk. Growth stocks may be more sensitive to market movements than other types of stocks because their prices are based largely on future expectations with respect to the stock’s issuer, its sector, and/or the overall economy. As a result, growth stocks may underperform value stocks or the overall equity market over a given period of time. |
| AAM SAWGRASS U.S. SMALL CAP QUALITY GROWTH ETF | Market Capitalization Risk, Small-Capitalization Investing Member | |
| Prospectus [Line Items] | |
| Risk [Text Block] | Small-Capitalization Investing Risk. The securities of small-capitalization companies may be more vulnerable to adverse issuer, market, political, or economic developments than securities of larger-capitalization companies. The securities of small-capitalization companies generally trade in lower volumes and are subject to greater and more unpredictable price changes than larger capitalization stocks or the stock market as a whole. Small-capitalization companies also may be particularly sensitive to changes in interest rates, government regulation, borrowing costs and earnings. |
| AAM SAWGRASS U.S. SMALL CAP QUALITY GROWTH ETF | Sector Risk, Industrials Sector Risk Member | |
| Prospectus [Line Items] | |
| Risk [Text Block] | Industrials Sector Risk. The industrials sector can be significantly affected by, among other things, worldwide economic growth, supply and demand for specific products and services, rapid technological developments, international political and economic developments, environmental issues, tariffs and trade barriers, and tax and governmental regulatory policies. As the demand for, or prices of, industrials increase, the value of the Fund’s investments generally would be expected to also increase. Conversely, declines in the demand for, or prices of, industrials generally would be expected to contribute to declines in the value of such securities. Such declines may occur quickly and without warning and may negatively impact the value of the Fund and your investment. |
| AAM SAWGRASS U.S. SMALL CAP QUALITY GROWTH ETF | Sector Risk, Health Care Sector Risk Member | |
| Prospectus [Line Items] | |
| Risk [Text Block] | Health Care Sector Risk. Companies in the health care sector are subject to extensive government regulation and their profitability can be significantly affected by restrictions on government reimbursement for medical expenses, rising costs of medical products and services, pricing pressure (including price discounting), limited product lines, an increased emphasis on the delivery of healthcare through outpatient services, loss or impairment of intellectual property rights and litigation regarding product or service liability. |
| AAM SAWGRASS U.S. SMALL CAP QUALITY GROWTH ETF | Risk Lose Money [Member] | |
| Prospectus [Line Items] | |
| Risk [Text Block] | As with any investment, there is a risk that you could lose all or a portion of your investment in the Fund. |
| AAM SLC Low Duration Income ETF | ETF Risks Member | |
| Prospectus [Line Items] | |
| Risk [Text Block] | ETF Risks. The Fund is an ETF, and, as a result of an ETF’s structure, it is exposed to the following risks: ◦Authorized Participants, Market Makers, and Liquidity Providers Concentration Risk. The Fund has a limited number of financial institutions that may act as Authorized Participants (“APs”). In addition, there may be a limited number of market makers and/or liquidity providers in the marketplace. To the extent either of the following events occur, Shares may trade at a material discount to NAV and possibly face delisting: (i) APs exit the business or otherwise become unable to process creation and/or redemption orders and no other APs step forward to perform these services, or (ii) market makers and/or liquidity providers exit the business or significantly reduce their business activities and no other entities step forward to perform their functions. ◦Cash Redemption Risk. When the Fund’s investment strategy requires it to redeem Shares for cash or to otherwise include cash as part of its redemption proceeds, it may be required to sell or unwind portfolio investments in order to obtain the cash needed to distribute redemption proceeds. This may cause the Fund to recognize a capital gain that it might not have recognized if it had made a redemption in-kind (i.e., distribute securities as payment of redemption proceeds). As a result, the Fund may pay out higher annual capital gain distributions than if the in-kind redemption process was used. ◦Costs of Buying or Selling Shares. Due to the costs of buying or selling Shares, including brokerage commissions imposed by brokers and bid-ask spreads, frequent trading of Shares may significantly reduce investment results and an investment in Shares may not be advisable for investors who anticipate regularly making small investments. ◦Shares May Trade at Prices Other Than NAV. As with all ETFs, Shares may be bought and sold in the secondary market at market prices. Although it is expected that the market price of Shares will approximate the Fund’s NAV, there may be times when the market price of Shares is more than the NAV intra-day (premium) or less than the NAV intra-day (discount) due to supply and demand of Shares or during periods of market volatility. This risk is heightened in times of market volatility, periods of steep market declines, and periods when there is limited trading activity for Shares in the secondary market, in which case such premiums or discounts may be significant. ◦Trading. Although Shares are listed for trading on NYSE Arca, Inc. (the “Exchange”) and may be traded on U.S. exchanges other than the Exchange, there can be no assurance that Shares will trade with any volume, or at all, on any stock exchange. There can be no assurance that an active trading market for such Shares will develop or be maintained. In stressed market conditions, the liquidity of Shares may begin to mirror the liquidity of the Fund’s underlying portfolio holdings, which can be significantly less liquid than Shares, and this could lead to differences between the market price of the Shares and the underlying value of those Shares.
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| AAM SLC Low Duration Income ETF | ETF Risks, Authorized Participants, Market Makers And Liquidity Providers Concentration Risk Member | |
| Prospectus [Line Items] | |
| Risk [Text Block] | Authorized Participants, Market Makers, and Liquidity Providers Concentration Risk. The Fund has a limited number of financial institutions that may act as Authorized Participants (“APs”). In addition, there may be a limited number of market makers and/or liquidity providers in the marketplace. To the extent either of the following events occur, Shares may trade at a material discount to NAV and possibly face delisting: (i) APs exit the business or otherwise become unable to process creation and/or redemption orders and no other APs step forward to perform these services, or (ii) market makers and/or liquidity providers exit the business or significantly reduce their business activities and no other entities step forward to perform their functions. |
| AAM SLC Low Duration Income ETF | ETF Risks, Costs Of Buying Or Selling Shares Risk Member | |
| Prospectus [Line Items] | |
| Risk [Text Block] | Costs of Buying or Selling Shares. Due to the costs of buying or selling Shares, including brokerage commissions imposed by brokers and bid-ask spreads, frequent trading of Shares may significantly reduce investment results and an investment in Shares may not be advisable for investors who anticipate regularly making small investments. |
| AAM SLC Low Duration Income ETF | ETF Risks, Shares May Trade At Prices Other Than NAV Risk Member | |
| Prospectus [Line Items] | |
| Risk [Text Block] | Shares May Trade at Prices Other Than NAV. As with all ETFs, Shares may be bought and sold in the secondary market at market prices. Although it is expected that the market price of Shares will approximate the Fund’s NAV, there may be times when the market price of Shares is more than the NAV intra-day (premium) or less than the NAV intra-day (discount) due to supply and demand of Shares or during periods of market volatility. This risk is heightened in times of market volatility, periods of steep market declines, and periods when there is limited trading activity for Shares in the secondary market, in which case such premiums or discounts may be significant. |
| AAM SLC Low Duration Income ETF | ETF Risks, Trading Risk Member | |
| Prospectus [Line Items] | |
| Risk [Text Block] | Trading. Although Shares are listed for trading on NYSE Arca, Inc. (the “Exchange”) and may be traded on U.S. exchanges other than the Exchange, there can be no assurance that Shares will trade with any volume, or at all, on any stock exchange. There can be no assurance that an active trading market for such Shares will develop or be maintained. In stressed market conditions, the liquidity of Shares may begin to mirror the liquidity of the Fund’s underlying portfolio holdings, which can be significantly less liquid than Shares, and this could lead to differences between the market price of the Shares and the underlying value of those Shares. |
| AAM SLC Low Duration Income ETF | Securities Lending Risk Member | |
| Prospectus [Line Items] | |
| Risk [Text Block] | Securities Lending Risk. The Fund may engage in securities lending. There are certain risks associated with securities lending, including the risk that the borrower may fail to return the securities on a timely basis or even the loss of rights in the collateral deposited by the borrower, if the borrower should fail financially. The Fund could also lose money in the event of a decline in the value of collateral provided for loaned securities or a decline in the value of any investments made with cash collateral. As a result, the Fund may lose money. |
| AAM SLC Low Duration Income ETF | Active Management Risk Member | |
| Prospectus [Line Items] | |
| Risk [Text Block] | Active Management Risk. The Fund is actively managed and may not meet its investment objective based on the Sub-Adviser’s success or failure to implement investment strategies for the Fund. |
| AAM SLC Low Duration Income ETF | CLO Manager Risk Member | |
| Prospectus [Line Items] | |
| Risk [Text Block] | CLO Manager Risk. CLOs are managed by entities which are independent of the Adviser and Sub-Adviser. CLO managers are responsible for selecting, managing and replacing the underlying loans within a particular CLO. CLO managers may have limited operating histories and may be subject to conflicts of interests. Such conflicts may include managing the assets of other clients or other investment vehicles, or receiving fees that incentivize maximization of the yield, and therefore the risk, of a CLO. Personnel and resource constraints, regulatory issues or other developments may adversely impact the ability and/or performance of the CLO manager and therefore may adversely impact the performance of the CLO securities in which the Fund invests. |
| AAM SLC Low Duration Income ETF | CLO Risk Member | |
| Prospectus [Line Items] | |
| Risk [Text Block] | CLO Risk. CLOs are securities backed by an underlying portfolio of loan obligations. CLOs issue classes or “tranches” that vary in risk and yield and may experience substantial losses due to actual defaults, decrease of market value due to collateral defaults and removal of subordinate tranches, market anticipation of defaults and investor aversion to CLO securities as a class. The risks of investing in CLOs depend largely on the tranche invested in and the type of the underlying loans in the tranche of the CLO in which the Fund invests. ◦Covenant Lite Loans Risk. CLOs may contain underlying loans that may be “covenant lite,” meaning that they have few or no financial maintenance covenants that would require the borrower to meet or exceed certain financial requirements. The absence of such covenants may reduce the ability of the lender to monitor the borrower’s financial performance and, if necessary, declare an event of default which would permit the lender to take action intended to mitigate losses from the borrower’s default on the loan. Therefore, CLOs with holdings of covenant lite loans may have greater difficulty in seeking remedies or taking other actions to preserve the value of loans in situations where a borrower faces declining financial performance. This could result in losses to the CLO and therefore the Fund.
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| AAM SLC Low Duration Income ETF | CLO Risk, Covenant Lite Loans Risk Member | |
| Prospectus [Line Items] | |
| Risk [Text Block] | Covenant Lite Loans Risk. CLOs may contain underlying loans that may be “covenant lite,” meaning that they have few or no financial maintenance covenants that would require the borrower to meet or exceed certain financial requirements. The absence of such covenants may reduce the ability of the lender to monitor the borrower’s financial performance and, if necessary, declare an event of default which would permit the lender to take action intended to mitigate losses from the borrower’s default on the loan. Therefore, CLOs with holdings of covenant lite loans may have greater difficulty in seeking remedies or taking other actions to preserve the value of loans in situations where a borrower faces declining financial performance. This could result in losses to the CLO and therefore the Fund. |
| AAM SLC Low Duration Income ETF | ETF Risks, Cash Redemption Risk Member | |
| Prospectus [Line Items] | |
| Risk [Text Block] | Cash Redemption Risk. When the Fund’s investment strategy requires it to redeem Shares for cash or to otherwise include cash as part of its redemption proceeds, it may be required to sell or unwind portfolio investments in order to obtain the cash needed to distribute redemption proceeds. This may cause the Fund to recognize a capital gain that it might not have recognized if it had made a redemption in-kind (i.e., distribute securities as payment of redemption proceeds). As a result, the Fund may pay out higher annual capital gain distributions than if the in-kind redemption process was used. |
| AAM SLC Low Duration Income ETF | Privately Issued Securities Risk Member | |
| Prospectus [Line Items] | |
| Risk [Text Block] | Privately Issued Securities Risk. The Fund may invest in privately issued securities issued under Rule 144A or Regulation S under the Securities Act of 1933, as amended. Sales of privately issued securities are subject to numerous restrictions including, but not limited to, that sales of privately issued securities may typically be made only to qualified institutional buyers, in privately negotiated transactions, to a limited number of purchasers, or in limited quantities after being held for a specific period of time. There may be limited numbers of available purchasers at times when the Fund wishes to sell privately issued securities, including during times of adverse market conditions. Privately issued securities may also trade at wider bid-ask spreads or be difficult to value. There can be no assurance that a privately issued security previously believed to be liquid at the time of purchase will continue to maintain a similar liquidity profile during the period in which it is held by the Fund or at the time of sale. Therefore, the Fund is subject to the risk that it may be unable to dispose of such securities without adversely impacting the price received upon sale. |
| AAM SLC Low Duration Income ETF | High-Yield Securities Risk Member | |
| Prospectus [Line Items] | |
| Risk [Text Block] | High-Yield Securities Risk. High-yield securities (also known as “junk bonds”) carry a greater degree of risk and are considered speculative by the major credit rating agencies. High-yield securities may be issued by companies that are restructuring, are smaller and less creditworthy, or are more highly indebted than other companies. This means that they may have more difficulty making scheduled payments of principal and interest. Changes in the value of high-yield securities are influenced more by changes in the financial and business position of the issuing company than by changes in interest rates when compared to investment grade securities. High-yield securities have greater volatility because there is less certainty that principal and interest payments will be made as scheduled. The Fund’s investments in high-yield securities expose it to a substantial degree of credit risk. These investments are considered speculative under traditional investment standards. Prices of high-yield securities will rise and fall primarily in response to actual or perceived changes in the issuer's financial health, although changes in market interest rates also will affect prices. High-yield securities may experience reduced liquidity and sudden and substantial decreases in price. |
| AAM SLC Low Duration Income ETF | Agency Debt Risk Member | |
| Prospectus [Line Items] | |
| Risk [Text Block] | Agency Debt Risk. The Fund may invest in unsecured bonds or debentures issued by U.S. government agencies, including Fannie Mae and Freddie Mac. Bonds or debentures issued by U.S. government agencies, government-sponsored entities, or government corporations, including, among others, Fannie Mae and Freddie Mac, are generally backed only by the general creditworthiness and reputation of the U.S. government agency, government-sponsored entity, or government corporation issuing the bond or debenture and are not guaranteed by the U.S. Department of the Treasury (“U.S. Treasury”) or backed by the full faith and credit of the U.S. government. As a result, there is uncertainty as to the current status of many obligations of Fannie Mae, Freddie Mac and other agencies that are placed under conservatorship of the federal government. Ginnie Mae securities are generally backed by the full faith and credit of the U.S. government. |
| AAM SLC Low Duration Income ETF | Cash And Cash Equivalents Risk Member | |
| Prospectus [Line Items] | |
| Risk [Text Block] | Cash and Cash Equivalents Risk. Holding cash or cash equivalents rather than securities or other instruments in which the Fund primarily invests, even strategically, may cause the Fund to risk losing opportunities to participate in market appreciation, and may cause the Fund to experience potentially lower returns than the Fund’s benchmark or other funds that remain fully invested. In rising markets, holding cash or cash equivalents will negatively affect the Fund’s performance relative to its benchmark. |
| AAM SLC Low Duration Income ETF | CMO Risk Member | |
| Prospectus [Line Items] | |
| Risk [Text Block] | CMO Risk. CMOs are securities backed by an underlying portfolio of mortgages. CMOs are subject to credit risk because underlying loan borrowers may default. CMO default rates tend to be sensitive to overall economic conditions and to localized property vacancy rates and prices. Borrower default rates may be significantly higher than estimated. Certain individual securities may be more sensitive to default rates because payments may be subordinated to other securities of the same issuer. The Sub-Adviser’s assessment, or a rating agency’s assessment, of borrower credit quality, default rates and loss rates may prove to be overly optimistic. Additionally, CMOs are subject to prepayment risk because the underlying loans held by the issuers may be paid off prior to maturity at faster or lower rates than expected. |
| AAM SLC Low Duration Income ETF | Fixed Income Securities Risk Member | |
| Prospectus [Line Items] | |
| Risk [Text Block] | Fixed Income Securities Risk. The Fund invests in fixed income securities. Fixed income securities, such as bonds and certain asset-backed securities, involve certain risks, which include: ◦Call Risk. During periods of falling interest rates, an issuer of a callable bond held by the Fund may “call” or repay the security prior to its stated maturity, and the Fund may have to reinvest the proceeds at lower interest rates, resulting in a decline in the Fund’s income. ◦Credit Risk. Credit risk refers to the possibility that the issuer of a security will not be able to make principal and interest payments when due. Changes in an issuer’s credit rating or the market’s perception of an issuer’s creditworthiness may also affect the value of an investment in that issuer. ◦Duration Risk. Prices of fixed income securities with longer durations are more sensitive to interest rate changes than those with shorter durations. ◦Event Risk. Event risk is the risk that corporate issuers may undergo restructurings, such as mergers, leveraged buyouts, takeovers, or similar events financed by increased debt. As a result of the added debt, the credit quality and market value of a company’s bonds and/or other debt securities may decline significantly. ◦Extension Risk. When interest rates rise, certain obligations will be paid off by the obligor more slowly than anticipated, causing the value of these securities to fall. ◦Income Risk. The Fund’s income may be adversely impacted if interest rates fall in a manner such that variable rate securities held directly or indirectly by the Fund make lower interest payments as a result of the decline in interest rates. ◦Interest Rate Risk. Generally, the value of fixed income securities will change inversely with changes in interest rates. As interest rates rise, the market value of fixed income securities tends to decrease. Conversely, as interest rates fall, the market value of fixed income securities tends to increase. This risk will be greater for long-term securities than for short-term securities. Changes in government intervention may have adverse effects on investments, volatility, and illiquidity in debt markets. ◦Liquidity Risk. Securities in which the Fund invests may have limited liquidity during times of adverse market conditions. Consequently, prices of securities may trade at wide bid-ask spreads at times in which the Fund seeks to sell certain assets. The Fund could potentially be unable to sell securities in a timely manner without substantially negatively impacting the price of such securities. As a result, the Fund’s performance could be adversely impacted. ◦Maturity Risk. The value of fixed income investments is also dependent on their maturity. Generally, the longer the maturity of a fixed income security, the greater its sensitivity to changes in interest rates. ◦Prepayment Risk. When interest rates fall, certain obligations will be paid off by the obligor more quickly than originally anticipated, and the Fund may have to invest the proceeds in securities with lower yields. ◦Valuation Risk. Valuation risk refers to the potential for assets in which the Fund invests being valued in a manner that differs from what the Fund is able to realize upon a sale of such assets. During times of market uncertainty, the valuation of certain securities may become more difficult and, therefore, the risk that an asset’s valuation will diverge from the price the Fund is ultimately able to realize upon the sale of such asset also increases. ◦Variable and Floating Rate Instrument Risk. Although floating or variable rate securities are generally less sensitive to interest rate risk than fixed rate securities, they are subject to credit, income, liquidity and default risk. The absence of an active market for these securities could make it difficult for the Fund to dispose of them if the issuer defaults.
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| AAM SLC Low Duration Income ETF | Fixed Income Securities Risk, Call Risk Member | |
| Prospectus [Line Items] | |
| Risk [Text Block] | Call Risk. During periods of falling interest rates, an issuer of a callable bond held by the Fund may “call” or repay the security prior to its stated maturity, and the Fund may have to reinvest the proceeds at lower interest rates, resulting in a decline in the Fund’s income. |
| AAM SLC Low Duration Income ETF | Fixed Income Securities Risk, Credit Risk Member | |
| Prospectus [Line Items] | |
| Risk [Text Block] | Credit Risk. Credit risk refers to the possibility that the issuer of a security will not be able to make principal and interest payments when due. Changes in an issuer’s credit rating or the market’s perception of an issuer’s creditworthiness may also affect the value of an investment in that issuer. |
| AAM SLC Low Duration Income ETF | Fixed Income Securities Risk, Duration Risk Member | |
| Prospectus [Line Items] | |
| Risk [Text Block] | Duration Risk. Prices of fixed income securities with longer durations are more sensitive to interest rate changes than those with shorter durations. |
| AAM SLC Low Duration Income ETF | Fixed Income Securities Risk, Event Risk Member | |
| Prospectus [Line Items] | |
| Risk [Text Block] | Event Risk. Event risk is the risk that corporate issuers may undergo restructurings, such as mergers, leveraged buyouts, takeovers, or similar events financed by increased debt. As a result of the added debt, the credit quality and market value of a company’s bonds and/or other debt securities may decline significantly. |
| AAM SLC Low Duration Income ETF | Fixed Income Securities Risk, Extension Risk Member | |
| Prospectus [Line Items] | |
| Risk [Text Block] | Extension Risk. When interest rates rise, certain obligations will be paid off by the obligor more slowly than anticipated, causing the value of these securities to fall. |
| AAM SLC Low Duration Income ETF | Fixed Income Securities Risk, Income Risk Member | |
| Prospectus [Line Items] | |
| Risk [Text Block] | Income Risk. The Fund’s income may be adversely impacted if interest rates fall in a manner such that variable rate securities held directly or indirectly by the Fund make lower interest payments as a result of the decline in interest rates. |
| AAM SLC Low Duration Income ETF | Fixed Income Securities Risk, Interest Rate Risk Member | |
| Prospectus [Line Items] | |
| Risk [Text Block] | Interest Rate Risk. Generally, the value of fixed income securities will change inversely with changes in interest rates. As interest rates rise, the market value of fixed income securities tends to decrease. Conversely, as interest rates fall, the market value of fixed income securities tends to increase. This risk will be greater for long-term securities than for short-term securities. Changes in government intervention may have adverse effects on investments, volatility, and illiquidity in debt markets. |
| AAM SLC Low Duration Income ETF | Fixed Income Securities Risk, Liquidity Risk Member | |
| Prospectus [Line Items] | |
| Risk [Text Block] | Liquidity Risk. Securities in which the Fund invests may have limited liquidity during times of adverse market conditions. Consequently, prices of securities may trade at wide bid-ask spreads at times in which the Fund seeks to sell certain assets. The Fund could potentially be unable to sell securities in a timely manner without substantially negatively impacting the price of such securities. As a result, the Fund’s performance could be adversely impacted. |
| AAM SLC Low Duration Income ETF | Fixed Income Securities Risk, Maturity Risk Member | |
| Prospectus [Line Items] | |
| Risk [Text Block] | Maturity Risk. The value of fixed income investments is also dependent on their maturity. Generally, the longer the maturity of a fixed income security, the greater its sensitivity to changes in interest rates. |
| AAM SLC Low Duration Income ETF | Fixed Income Securities Risk, Prepayment Risk Member | |
| Prospectus [Line Items] | |
| Risk [Text Block] | Prepayment Risk. When interest rates fall, certain obligations will be paid off by the obligor more quickly than originally anticipated, and the Fund may have to invest the proceeds in securities with lower yields. |
| AAM SLC Low Duration Income ETF | Fixed Income Securities Risk, Valuation Risk Member | |
| Prospectus [Line Items] | |
| Risk [Text Block] | Valuation Risk. Valuation risk refers to the potential for assets in which the Fund invests being valued in a manner that differs from what the Fund is able to realize upon a sale of such assets. During times of market uncertainty, the valuation of certain securities may become more difficult and, therefore, the risk that an asset’s valuation will diverge from the price the Fund is ultimately able to realize upon the sale of such asset also increases. |
| AAM SLC Low Duration Income ETF | Fixed Income Securities Risk, Variable And Floating Rate Instrument Risk Member | |
| Prospectus [Line Items] | |
| Risk [Text Block] | Variable and Floating Rate Instrument Risk. Although floating or variable rate securities are generally less sensitive to interest rate risk than fixed rate securities, they are subject to credit, income, liquidity and default risk. The absence of an active market for these securities could make it difficult for the Fund to dispose of them if the issuer defaults. |
| AAM SLC Low Duration Income ETF | Government Obligations Risk Member | |
| Prospectus [Line Items] | |
| Risk [Text Block] | Government Obligations Risk. The Fund may invest in securities issued by the U.S. government or its agencies or instrumentalities. There can be no guarantee that the United States will be able to meet its payment obligations with respect to such securities. Further, not all obligations issued by a U.S. government-related entity are backed by the full faith and credit of the U.S. government. Additionally, market prices and yields of securities supported by the full faith and credit of the U.S. government or other countries may decline or be negative for short or long periods of time. |
| AAM SLC Low Duration Income ETF | High Portfolio Turnover Risk Member | |
| Prospectus [Line Items] | |
| Risk [Text Block] | High Portfolio Turnover Risk. The Fund may frequently buy and sell portfolio securities and other assets to rebalance the Fund’s exposure to specific securities. Higher portfolio turnover may result in the Fund paying higher levels of transaction costs and generating greater tax liabilities for shareholders. Portfolio turnover risk may cause the Fund’s performance to be less than you expect. |
| AAM SLC Low Duration Income ETF | Market Risk Member | |
| Prospectus [Line Items] | |
| Risk [Text Block] | Market Risk. The trading prices of debt securities and other instruments fluctuate in response to a variety of factors. The Fund’s NAV and market price may fluctuate significantly in response to these and other factors. As a result, an investor could lose money over short or long periods of time. |
| AAM SLC Low Duration Income ETF | Mortgage- And Asset-Backed Securities Risk Member | |
| Prospectus [Line Items] | |
| Risk [Text Block] | Mortgage- and Asset-Backed Securities Risk. Mortgage- and asset-backed securities are more sensitive to interest rate risk than other types of fixed income securities. Modest movements in interest rates (both increases and decreases) may quickly and significantly reduce the value of certain types of these securities. When interest rates fall, mortgage- and asset-backed securities may be subject to prepayment risk. If a borrower prepays some or the entire principal owed, the Fund may have to replace the security by investing the proceeds in a security with a lower yield. This could reduce the share price and income distributions of the Fund, which invests in mortgage- and asset-backed securities. When interest rates rise, certain types of mortgage- and asset-backed securities are subject to extension risk. Mortgage- and asset-backed securities can also be subject to the risk of default on the underlying residential or commercial mortgage(s) or other assets. Weakening real estate markets may cause default rates to rise, which would result in a decline in the value of mortgage-backed securities. |
| AAM SLC Low Duration Income ETF | Risk Lose Money [Member] | |
| Prospectus [Line Items] | |
| Risk [Text Block] | As with any investment, there is a risk that you could lose all or a portion of your investment in the Fund. |
| AAM Todd International Intrinsic Value ETF | Equity Market Risk Member | |
| Prospectus [Line Items] | |
| Risk [Text Block] | Equity Market Risk. The equity securities held in the Fund’s portfolio may experience sudden, unpredictable drops in value or long periods of decline in value. This may occur because of factors that affect securities markets generally or factors affecting specific issuers, industries, or sectors in which the Fund invests. Common stocks are generally exposed to greater risk than other types of securities, such as preferred stock and debt obligations, because common stockholders generally have inferior rights to receive payment from issuers. In addition, local, regional or global events such as war, including Russia’s invasion of Ukraine, acts of terrorism, market volatility related to global trade policy and the imposition of tariffs, the spread of infectious diseases or other public health issues (such as the global pandemic caused by the COVID-19 virus), recessions, rising inflation, trade wars and tariffs, or other events could have a significant negative impact on the Fund and its investments. Such events may affect certain geographic regions, countries, sectors and industries more significantly than others. Such events could adversely affect the prices and liquidity of the Fund’s portfolio securities or other instruments and could result in disruptions in the trading markets. |
| AAM Todd International Intrinsic Value ETF | ETF Risks Member | |
| Prospectus [Line Items] | |
| Risk [Text Block] | ETF Risks. The Fund is an ETF, and, as a result of an ETF’s structure, it is exposed to the following risks: ◦Authorized Participants, Market Makers, and Liquidity Providers Concentration Risk. The Fund has a limited number of financial institutions that may act as Authorized Participants (“APs”). In addition, there may be a limited number of market makers and/or liquidity providers in the marketplace. To the extent either of the following events occur, Shares may trade at a material discount to NAV and possibly face delisting: (i) APs exit the business or otherwise become unable to process creation and/or redemption orders and no other APs step forward to perform these services, or (ii) market makers and/or liquidity providers exit the business or significantly reduce their business activities and no other entities step forward to perform their functions. ◦Costs of Buying or Selling Shares. Due to the costs of buying or selling Shares, including brokerage commissions imposed by brokers and bid-ask spreads, frequent trading of Shares may significantly reduce investment results and an investment in Shares may not be advisable for investors who anticipate regularly making small investments. ◦Shares May Trade at Prices Other Than NAV. As with all ETFs, Shares may be bought and sold in the secondary market at market prices. Although it is expected that the market price of Shares will approximate the Fund’s NAV, there may be times when the market price of Shares is more than the NAV intra-day (premium) or less than the NAV intra-day (discount) due to supply and demand of Shares or during periods of market volatility. This risk is heightened in times of market volatility, periods of steep market declines, and periods when there is limited trading activity for Shares in the secondary market, in which case such premiums or discounts may be significant. Because securities held by the Fund may trade on foreign exchanges that are closed when the Fund’s primary listing exchange is open, the Fund is likely to experience premiums or discounts greater than those of ETFs that invest in and hold only securities and other investments that are listed and trade in the U.S. ◦Trading. Although Shares are listed for trading on NYSE Arca, Inc. (the “Exchange”) and may be traded on U.S. exchanges other than the Exchange, there can be no assurance that Shares will trade with any volume, or at all, on any stock exchange. There can be no assurance that an active trading market for such Shares will develop or be maintained. In stressed market conditions, the liquidity of Shares may begin to mirror the liquidity of the Fund’s underlying portfolio holdings, which can be significantly less liquid than Shares, and this could lead to differences between the market price of the Shares and the underlying value of those Shares.
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| AAM Todd International Intrinsic Value ETF | ETF Risks, Authorized Participants, Market Makers And Liquidity Providers Concentration Risk Member | |
| Prospectus [Line Items] | |
| Risk [Text Block] | Authorized Participants, Market Makers, and Liquidity Providers Concentration Risk. The Fund has a limited number of financial institutions that may act as Authorized Participants (“APs”). In addition, there may be a limited number of market makers and/or liquidity providers in the marketplace. To the extent either of the following events occur, Shares may trade at a material discount to NAV and possibly face delisting: (i) APs exit the business or otherwise become unable to process creation and/or redemption orders and no other APs step forward to perform these services, or (ii) market makers and/or liquidity providers exit the business or significantly reduce their business activities and no other entities step forward to perform their functions. |
| AAM Todd International Intrinsic Value ETF | ETF Risks, Costs Of Buying Or Selling Shares Risk Member | |
| Prospectus [Line Items] | |
| Risk [Text Block] | Costs of Buying or Selling Shares. Due to the costs of buying or selling Shares, including brokerage commissions imposed by brokers and bid-ask spreads, frequent trading of Shares may significantly reduce investment results and an investment in Shares may not be advisable for investors who anticipate regularly making small investments. |
| AAM Todd International Intrinsic Value ETF | ETF Risks, Shares May Trade At Prices Other Than NAV Risk Member | |
| Prospectus [Line Items] | |
| Risk [Text Block] | Shares May Trade at Prices Other Than NAV. As with all ETFs, Shares may be bought and sold in the secondary market at market prices. Although it is expected that the market price of Shares will approximate the Fund’s NAV, there may be times when the market price of Shares is more than the NAV intra-day (premium) or less than the NAV intra-day (discount) due to supply and demand of Shares or during periods of market volatility. This risk is heightened in times of market volatility, periods of steep market declines, and periods when there is limited trading activity for Shares in the secondary market, in which case such premiums or discounts may be significant. Because securities held by the Fund may trade on foreign exchanges that are closed when the Fund’s primary listing exchange is open, the Fund is likely to experience premiums or discounts greater than those of ETFs that invest in and hold only securities and other investments that are listed and trade in the U.S. |
| AAM Todd International Intrinsic Value ETF | ETF Risks, Trading Risk Member | |
| Prospectus [Line Items] | |
| Risk [Text Block] | Trading. Although Shares are listed for trading on NYSE Arca, Inc. (the “Exchange”) and may be traded on U.S. exchanges other than the Exchange, there can be no assurance that Shares will trade with any volume, or at all, on any stock exchange. There can be no assurance that an active trading market for such Shares will develop or be maintained. In stressed market conditions, the liquidity of Shares may begin to mirror the liquidity of the Fund’s underlying portfolio holdings, which can be significantly less liquid than Shares, and this could lead to differences between the market price of the Shares and the underlying value of those Shares. |
| AAM Todd International Intrinsic Value ETF | Sector Risk Member | |
| Prospectus [Line Items] | |
| Risk [Text Block] | Sector Risk. To the extent the Fund invests more heavily in particular sectors of the economy, its performance will be especially sensitive to developments that significantly affect those sectors. ◦Financials Sector Risk. This sector, which includes banks, insurance companies, and financial service firms, can be significantly affected by changes in interest rates, government regulation, the rate of defaults on corporate, consumer and government debt, the availability and cost of capital, and fallout from the housing and sub-prime mortgage crisis. Banks, in particular, are subject to volatile interest rates, severe price competition, and extensive government oversight and regulation, which may limit certain economic activities available to banks, impact their fees and overall profitability, and establish capital maintenance requirements. In addition, banks may have concentrated portfolios of loans or investments that make them vulnerable to economic conditions that affect that industry. Insurance companies are subject to similar risks as banks, including adverse economic conditions, changes in interest rates, increased competition and government regulation, but insurance companies are more at risk from changes in tax law, government imposed premium rate caps, and catastrophic events, such as earthquakes, floods, hurricanes and terrorist acts. This sector has experienced significant losses in the recent past, and the impact of higher interest rates, more stringent capital requirements, and of recent or future regulation on any individual financial company, or on the sector as a whole, cannot be predicted. In recent years, cyber attacks and technology malfunctions and failures have become increasingly frequent in the financial sector and have caused significant losses. ◦Industrials Sector Risk. The industrials sector can be significantly affected by, among other things, worldwide economic growth, supply and demand for specific products and services, rapid technological developments, international political and economic developments, environmental issues, tariffs and trade barriers, and tax and governmental regulatory policies. As the demand for, or prices of, industrials increase, the value of the Fund’s investments generally would be expected to also increase. Conversely, declines in the demand for, or prices of, industrials generally would be expected to contribute to declines in the value of such securities. Such declines may occur quickly and without warning and may negatively impact the value of the Fund and your investment.
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| AAM Todd International Intrinsic Value ETF | Securities Lending Risk Member | |
| Prospectus [Line Items] | |
| Risk [Text Block] | Securities Lending Risk. The Fund may engage in securities lending. There are certain risks associated with securities lending, including the risk that the borrower may fail to return the securities on a timely basis or even the loss of rights in the collateral deposited by the borrower, if the borrower should fail financially. The Fund could also lose money in the event of a decline in the value of collateral provided for loaned securities or a decline in the value of any investments made with cash collateral. As a result, the Fund may lose money. |
| AAM Todd International Intrinsic Value ETF | Active Management Risk Member | |
| Prospectus [Line Items] | |
| Risk [Text Block] | Active Management Risk. The Fund is actively managed and may not meet its investment objective based on the Sub-Adviser’s success or failure to implement investment strategies for the Fund. The Adviser relies on quantitative data that may prove to be incorrect or incomplete. |
| AAM Todd International Intrinsic Value ETF | New Fund Risk Member | |
| Prospectus [Line Items] | |
| Risk [Text Block] | New Fund Risk. The Fund is a recently organized investment company with no operating history. As a result, prospective investors have no track record or history on which to base their investment decision. Additionally, Todd has not previously managed a registered fund, which may increase the risk of investing in the Fund. |
| AAM Todd International Intrinsic Value ETF | Sector Risk, Financial Sector Risk Member | |
| Prospectus [Line Items] | |
| Risk [Text Block] | Financials Sector Risk. This sector, which includes banks, insurance companies, and financial service firms, can be significantly affected by changes in interest rates, government regulation, the rate of defaults on corporate, consumer and government debt, the availability and cost of capital, and fallout from the housing and sub-prime mortgage crisis. Banks, in particular, are subject to volatile interest rates, severe price competition, and extensive government oversight and regulation, which may limit certain economic activities available to banks, impact their fees and overall profitability, and establish capital maintenance requirements. In addition, banks may have concentrated portfolios of loans or investments that make them vulnerable to economic conditions that affect that industry. Insurance companies are subject to similar risks as banks, including adverse economic conditions, changes in interest rates, increased competition and government regulation, but insurance companies are more at risk from changes in tax law, government imposed premium rate caps, and catastrophic events, such as earthquakes, floods, hurricanes and terrorist acts. This sector has experienced significant losses in the recent past, and the impact of higher interest rates, more stringent capital requirements, and of recent or future regulation on any individual financial company, or on the sector as a whole, cannot be predicted. In recent years, cyber attacks and technology malfunctions and failures have become increasingly frequent in the financial sector and have caused significant losses. |
| AAM Todd International Intrinsic Value ETF | Sector Risk, Industrials Sector Risk Member | |
| Prospectus [Line Items] | |
| Risk [Text Block] | Industrials Sector Risk. The industrials sector can be significantly affected by, among other things, worldwide economic growth, supply and demand for specific products and services, rapid technological developments, international political and economic developments, environmental issues, tariffs and trade barriers, and tax and governmental regulatory policies. As the demand for, or prices of, industrials increase, the value of the Fund’s investments generally would be expected to also increase. Conversely, declines in the demand for, or prices of, industrials generally would be expected to contribute to declines in the value of such securities. Such declines may occur quickly and without warning and may negatively impact the value of the Fund and your investment. |
| AAM Todd International Intrinsic Value ETF | ADR Risk Member | |
| Prospectus [Line Items] | |
| Risk [Text Block] | ADR Risk. ADRs involve risks similar to those associated with investments in foreign securities, such as changes in political or economic conditions of other countries and changes in the exchange rates of foreign currencies. ADRs listed on U.S. exchanges are issued by banks or trust companies, and ADRs entitle the holder to all dividends and capital gains that are paid out on the underlying foreign shares (“Underlying Shares”). When the Fund invests in ADRs as a substitute for an investment directly in the Underlying Shares, the Fund is exposed to the risk that the ADRs may not provide a return that corresponds precisely with that of the Underlying Shares. |
| AAM Todd International Intrinsic Value ETF | Capital Controls And Sanctions Risk Member | |
| Prospectus [Line Items] | |
| Risk [Text Block] | Capital Controls and Sanctions Risk. Economic conditions, such as volatile currency exchange rates and interest rates, political events, military action and other conditions may, without prior warning, lead to foreign government intervention (including intervention by the U.S. government with respect to foreign governments, economic sectors, foreign companies and related securities and interests) and the imposition of capital controls and/or sanctions, which may also include retaliatory actions of one government against another government, such as seizure of assets. Capital controls and/or sanctions include the prohibition of, or restrictions on, the ability to transfer currency, securities or other assets. Capital controls and/or sanctions may also impact the ability of the Fund to buy, sell or otherwise transfer securities or currency, negatively impact the value and/or liquidity of such instruments, adversely affect the trading market and price for Shares, and cause the Fund to decline in value. |
| AAM Todd International Intrinsic Value ETF | Currency Exchange Rate Risk Member | |
| Prospectus [Line Items] | |
| Risk [Text Block] | Currency Exchange Rate Risk. The Fund may invest in investments that provide exposure to non-U.S. currencies. Changes in currency exchange rates and the relative value of non-U.S. currencies will affect the value of the Fund’s investment and the value of your Shares. Currency exchange rates can be very volatile and can change quickly and unpredictably. As a result, the value of an investment in the Fund may change quickly and without warning and you may lose money. |
| AAM Todd International Intrinsic Value ETF | Emerging Markets Risk Member | |
| Prospectus [Line Items] | |
| Risk [Text Block] | Emerging Markets Risk. The Fund may invest in companies organized in emerging market nations. Investments in securities and instruments traded in developing or emerging markets, or that provide exposure to such securities or markets, can involve additional risks relating to political, economic, or regulatory conditions not associated with investments in U.S. securities and instruments or investments in more developed international markets. Such conditions may impact the ability of the Fund to buy, sell or otherwise transfer securities, adversely affect the trading market and price for Shares and cause the Fund to decline in value. |
| AAM Todd International Intrinsic Value ETF | Foreign Securities Risk Member | |
| Prospectus [Line Items] | |
| Risk [Text Block] | Foreign Securities Risk. Investments in securities of foreign companies, including through ADRs, involve certain risks that may not be present with investments in U.S. securities. For example, the value of such securities may be subject to risk of decline due to foreign currency fluctuations, the imposition of tariffs, or to political or economic instability. There may be less information publicly available about a non-U.S. issuer than a U.S. issuer. Such investments also may be subject to withholding or other taxes and may be indirectly subject to additional trading, settlement, custodial, and operational risks. These and other factors can make investments in the Fund more volatile and potentially less liquid than other types of investments. Companies in many foreign markets are not subject to the same degree of regulatory requirements, accounting standards or auditor oversight as companies in the U.S., and as a result, information about the securities in which the Fund invests may be less reliable or complete. Foreign markets often have less reliable securities valuations and greater risk associated with the custody of securities than the U.S. There may be significant obstacles to obtaining information necessary for investigations into or litigation against companies and shareholders may have limited legal remedies. |
| AAM Todd International Intrinsic Value ETF | Geographic Investment Risk Member | |
| Prospectus [Line Items] | |
| Risk [Text Block] | Geographic Investment Risk. To the extent the Fund invests a significant portion of its assets in the securities of companies of a single country or region, it is more likely to be impacted by events or conditions affecting that country or region. ◦Risks Related to Investing in Japan. The Japanese economy may be subject to considerable degrees of economic, political and social instability, which could have a negative impact on Japanese securities. While the Japanese economy has recently emerged from a prolonged economic downturn, Japan’s economic growth rate may remain relatively low in the future. In addition, Japan is subject to the risk of natural disasters, such as earthquakes, volcanoes, typhoons and tsunamis. Additionally, decreasing U.S. imports, new trade regulations, changes in the U.S. dollar exchange rates, a recession in the United States or continued increases in foreclosure rates may have an adverse impact on the economy of Japan. Japan also has few natural resources, and any fluctuation or shortage in the commodity markets could have a negative impact on Japanese securities. ◦Risks Related to Investing in Europe. The economies and markets of European countries are often closely connected and interdependent, and events in one country in Europe can have an adverse impact on other European countries. The Fund makes investments in securities of issuers that are domiciled in, or have significant operations in, member countries of the European Union (“EU”) that are subject to economic and monetary controls that can adversely affect the Fund’s investments. The European financial markets have experienced volatility and adverse trends in recent years and these events have adversely affected the exchange rate of the euro and may continue to significantly affect other European countries. Decreasing imports or exports, changes in governmental or EU regulations on trade, changes in the exchange rate of the euro, the default or threat of default by an EU member country on its sovereign debt, and/or an economic recession in an EU member country may have a significant adverse effect on the economies of EU member countries and their trading partners, including some or all of the European countries in which the Fund invests. Acts of war in Europe, including Russia’s large-scale military invasion of Ukraine, and the resulting sanctions by and against European nations could also have a severe adverse effect on both European and global economies, which in turn could affect the value of the Fund’s investments. The United Kingdom (“UK”) formally exited from the EU on January 31, 2020 (known as “Brexit”), and effective December 31, 2020, the UK ended a transition period during which it continued to abide by the EU’s rules and the UK’s trade relationships with the EU were generally unchanged. Following this transition period, the impact on the UK and European economies and the broader global economy could be significant, resulting in negative impacts, such as increased volatility and illiquidity, and potentially lower economic growth of markets in the UK, Europe and globally, which may adversely affect the value of the Fund’s investments. Russia’s large-scale invasion of Ukraine on February 24, 2022 has led to various countries imposing economic sanctions on certain Russian individuals and Russian corporate and banking entities. A number of jurisdictions have also instituted broader sanctions on Russia. Further, as of the date of this Prospectus, the Russian securities markets effectively have not been open for trading by foreign investors since February 28, 2022. Russia’s military incursion and resulting sanctions could have a severe adverse effect on both regional and global economies, which in turn could affect the value of the Fund’s investments. Eastern European markets are particularly sensitive to social, political, economic, and currency events in Russia and may suffer heavy losses as a result of their trading and investment links to the Russian economy and currency. Changes in regulations on trade, decreasing imports or exports, changes in the exchange rate of the euro, a significant influx of refugees, and recessions among European countries may have a significant adverse effect on the economies of other European countries including those of Eastern Europe.
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| AAM Todd International Intrinsic Value ETF | Geographic Investment Risk, Risks Related To Investing In Japan Risk Member | |
| Prospectus [Line Items] | |
| Risk [Text Block] | Risks Related to Investing in Japan. The Japanese economy may be subject to considerable degrees of economic, political and social instability, which could have a negative impact on Japanese securities. While the Japanese economy has recently emerged from a prolonged economic downturn, Japan’s economic growth rate may remain relatively low in the future. In addition, Japan is subject to the risk of natural disasters, such as earthquakes, volcanoes, typhoons and tsunamis. Additionally, decreasing U.S. imports, new trade regulations, changes in the U.S. dollar exchange rates, a recession in the United States or continued increases in foreclosure rates may have an adverse impact on the economy of Japan. Japan also has few natural resources, and any fluctuation or shortage in the commodity markets could have a negative impact on Japanese securities. |
| AAM Todd International Intrinsic Value ETF | Geographic Investment Risk, Risks Related To Investing In Europe Risk Member | |
| Prospectus [Line Items] | |
| Risk [Text Block] | Risks Related to Investing in Europe. The economies and markets of European countries are often closely connected and interdependent, and events in one country in Europe can have an adverse impact on other European countries. The Fund makes investments in securities of issuers that are domiciled in, or have significant operations in, member countries of the European Union (“EU”) that are subject to economic and monetary controls that can adversely affect the Fund’s investments. The European financial markets have experienced volatility and adverse trends in recent years and these events have adversely affected the exchange rate of the euro and may continue to significantly affect other European countries. Decreasing imports or exports, changes in governmental or EU regulations on trade, changes in the exchange rate of the euro, the default or threat of default by an EU member country on its sovereign debt, and/or an economic recession in an EU member country may have a significant adverse effect on the economies of EU member countries and their trading partners, including some or all of the European countries in which the Fund invests. Acts of war in Europe, including Russia’s large-scale military invasion of Ukraine, and the resulting sanctions by and against European nations could also have a severe adverse effect on both European and global economies, which in turn could affect the value of the Fund’s investments. The United Kingdom (“UK”) formally exited from the EU on January 31, 2020 (known as “Brexit”), and effective December 31, 2020, the UK ended a transition period during which it continued to abide by the EU’s rules and the UK’s trade relationships with the EU were generally unchanged. Following this transition period, the impact on the UK and European economies and the broader global economy could be significant, resulting in negative impacts, such as increased volatility and illiquidity, and potentially lower economic growth of markets in the UK, Europe and globally, which may adversely affect the value of the Fund’s investments. Russia’s large-scale invasion of Ukraine on February 24, 2022 has led to various countries imposing economic sanctions on certain Russian individuals and Russian corporate and banking entities. A number of jurisdictions have also instituted broader sanctions on Russia. Further, as of the date of this Prospectus, the Russian securities markets effectively have not been open for trading by foreign investors since February 28, 2022. Russia’s military incursion and resulting sanctions could have a severe adverse effect on both regional and global economies, which in turn could affect the value of the Fund’s investments. Eastern European markets are particularly sensitive to social, political, economic, and currency events in Russia and may suffer heavy losses as a result of their trading and investment links to the Russian economy and currency. Changes in regulations on trade, decreasing imports or exports, changes in the exchange rate of the euro, a significant influx of refugees, and recessions among European countries may have a significant adverse effect on the economies of other European countries including those of Eastern Europe.
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| AAM Todd International Intrinsic Value ETF | Geopolitical Risk Member | |
| Prospectus [Line Items] | |
| Risk [Text Block] | Geopolitical Risk. Some countries and regions in which the Fund invests have experienced security concerns, war or threats of war and aggression, terrorism, economic uncertainty, natural and environmental disasters and/or systemic market dislocations that have led, and in the future may lead, to increased short-term market volatility and may have adverse long-term effects on the U.S. and world economies and markets generally, each of which may negatively impact the Fund’s investments. |
| AAM Todd International Intrinsic Value ETF | Large-Capitalization Investing Risk Member | |
| Prospectus [Line Items] | |
| Risk [Text Block] | Large-Capitalization Investing Risk. The Fund’s performance may be adversely affected if securities of large cap companies underperform securities of smaller-capitalization companies or the market as a whole. The securities of large cap companies may be relatively mature compared to smaller companies and therefore subject to slower growth during times of economic expansion. Large-capitalization companies may also be unable to respond quickly to new competitive challenges, such as changes in technology and consumer tastes. |
| AAM Todd International Intrinsic Value ETF | Liquidity Risk Member | |
| Prospectus [Line Items] | |
| Risk [Text Block] | Liquidity Risk. Liquidity risk exists when particular investments are difficult to purchase or sell. This can reduce the Fund’s returns because the Fund may be unable to transact at advantageous times or prices. |
| AAM Todd International Intrinsic Value ETF | Risk Lose Money [Member] | |
| Prospectus [Line Items] | |
| Risk [Text Block] | As with any investment, there is a risk that you could lose all or a portion of your investment in the Fund. |
| AAM Transformers ETF | Equity Market Risk Member | |
| Prospectus [Line Items] | |
| Risk [Text Block] | Equity Market Risk. The equity securities held in the Fund’s portfolio may experience sudden, unpredictable drops in value or long periods of decline in value. This may occur because of factors that affect securities markets generally or factors affecting specific issuers, industries, or sectors in which the Fund invests. Common stocks are generally exposed to greater risk than other types of securities, such as preferred stock and debt obligations, because common stockholders generally have inferior rights to receive payment from issuers. In addition, local, regional or global events such as war, including Russia’s invasion of Ukraine, acts of terrorism, spread of infectious diseases or other public health issues (such as the global pandemic caused by the COVID-19 virus), recessions, rising inflation, trade wars and tariffs, or other events could have a significant negative impact on the Fund and its investments. Such events may affect certain geographic regions, countries, sectors and industries more significantly than others. Such events could adversely affect the prices and liquidity of the Fund’s portfolio securities or other instruments and could result in disruptions in the trading markets. |
| AAM Transformers ETF | ETF Risks Member | |
| Prospectus [Line Items] | |
| Risk [Text Block] | ETF Risks. The Fund is an exchange-traded fund (“ETF”), and, as a result of an ETF’s structure, it is exposed to the following risks: ◦Authorized Participants, Market Makers, and Liquidity Providers Concentration Risk. The Fund has a limited number of financial institutions that may act as Authorized Participants (“APs”). In addition, there may be a limited number of market makers and/or liquidity providers in the marketplace. To the extent either of the following events occur, Shares may trade at a material discount to NAV and possibly face delisting: (i) APs exit the business or otherwise become unable to process creation and/or redemption orders and no other APs step forward to perform these services, or (ii) market makers and/or liquidity providers exit the business or significantly reduce their business activities and no other entities step forward to perform their functions. ◦Costs of Buying or Selling Shares. Due to the costs of buying or selling Shares, including brokerage commissions imposed by brokers and bid-ask spreads, frequent trading of Shares may significantly reduce investment results and an investment in Shares may not be advisable for investors who anticipate regularly making small investments. ◦Shares May Trade at Prices Other Than NAV. As with all ETFs, Shares may be bought and sold in the secondary market at market prices. Although it is expected that the market price of Shares will approximate the Fund’s NAV, there may be times when the market price of Shares is more than the NAV intra-day (premium) or less than the NAV intra-day (discount) due to supply and demand of Shares or during periods of market volatility. This risk is heightened in times of market volatility, periods of steep market declines, and periods when there is limited trading activity for Shares in the secondary market, in which case such premiums or discounts may be significant. ◦Trading. Although Shares are listed for trading on NYSE Arca, Inc. (the “Exchange”) and may be traded on U.S. exchanges other than the Exchange, there can be no assurance that Shares will trade with any volume, or at all, on any stock exchange. There can be no assurance that an active trading market for such Shares will develop or be maintained. In stressed market conditions, the liquidity of Shares may begin to mirror the liquidity of the Fund’s underlying portfolio holdings, which can be significantly less liquid than Shares, and this could lead to differences between the market price of the Shares and the underlying value of those Shares.
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| AAM Transformers ETF | ETF Risks, Authorized Participants, Market Makers And Liquidity Providers Concentration Risk Member | |
| Prospectus [Line Items] | |
| Risk [Text Block] | Authorized Participants, Market Makers, and Liquidity Providers Concentration Risk. The Fund has a limited number of financial institutions that may act as Authorized Participants (“APs”). In addition, there may be a limited number of market makers and/or liquidity providers in the marketplace. To the extent either of the following events occur, Shares may trade at a material discount to NAV and possibly face delisting: (i) APs exit the business or otherwise become unable to process creation and/or redemption orders and no other APs step forward to perform these services, or (ii) market makers and/or liquidity providers exit the business or significantly reduce their business activities and no other entities step forward to perform their functions. |
| AAM Transformers ETF | ETF Risks, Costs Of Buying Or Selling Shares Risk Member | |
| Prospectus [Line Items] | |
| Risk [Text Block] | Costs of Buying or Selling Shares. Due to the costs of buying or selling Shares, including brokerage commissions imposed by brokers and bid-ask spreads, frequent trading of Shares may significantly reduce investment results and an investment in Shares may not be advisable for investors who anticipate regularly making small investments. |
| AAM Transformers ETF | ETF Risks, Shares May Trade At Prices Other Than NAV Risk Member | |
| Prospectus [Line Items] | |
| Risk [Text Block] | Shares May Trade at Prices Other Than NAV. As with all ETFs, Shares may be bought and sold in the secondary market at market prices. Although it is expected that the market price of Shares will approximate the Fund’s NAV, there may be times when the market price of Shares is more than the NAV intra-day (premium) or less than the NAV intra-day (discount) due to supply and demand of Shares or during periods of market volatility. This risk is heightened in times of market volatility, periods of steep market declines, and periods when there is limited trading activity for Shares in the secondary market, in which case such premiums or discounts may be significant. |
| AAM Transformers ETF | ETF Risks, Trading Risk Member | |
| Prospectus [Line Items] | |
| Risk [Text Block] | Trading. Although Shares are listed for trading on NYSE Arca, Inc. (the “Exchange”) and may be traded on U.S. exchanges other than the Exchange, there can be no assurance that Shares will trade with any volume, or at all, on any stock exchange. There can be no assurance that an active trading market for such Shares will develop or be maintained. In stressed market conditions, the liquidity of Shares may begin to mirror the liquidity of the Fund’s underlying portfolio holdings, which can be significantly less liquid than Shares, and this could lead to differences between the market price of the Shares and the underlying value of those Shares. |
| AAM Transformers ETF | Market Capitalization Risk Member | |
| Prospectus [Line Items] | |
| Risk [Text Block] | Market Capitalization Risk. ◦Large-Capitalization Investing. The securities of large-capitalization companies may be relatively mature compared to smaller companies and therefore subject to slower growth during times of economic expansion. Large-capitalization companies may also be unable to respond quickly to new competitive challenges, such as changes in technology and consumer tastes. ◦Mid-Capitalization Investing. The securities of mid-capitalization companies may be more vulnerable to adverse issuer, market, political, or economic developments than securities of large-capitalization companies. The securities of mid-capitalization companies generally trade in lower volumes and are subject to greater and more unpredictable price changes than large capitalization stocks or the stock market as a whole.
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| AAM Transformers ETF | Market Capitalization Risk, Large-Capitalization Investing Risk Member | |
| Prospectus [Line Items] | |
| Risk [Text Block] | Large-Capitalization Investing. The securities of large-capitalization companies may be relatively mature compared to smaller companies and therefore subject to slower growth during times of economic expansion. Large-capitalization companies may also be unable to respond quickly to new competitive challenges, such as changes in technology and consumer tastes. |
| AAM Transformers ETF | Market Capitalization Risk, Mid-Capitalization Investing Member | |
| Prospectus [Line Items] | |
| Risk [Text Block] | Mid-Capitalization Investing. The securities of mid-capitalization companies may be more vulnerable to adverse issuer, market, political, or economic developments than securities of large-capitalization companies. The securities of mid-capitalization companies generally trade in lower volumes and are subject to greater and more unpredictable price changes than large capitalization stocks or the stock market as a whole. |
| AAM Transformers ETF | Sector Risk Member | |
| Prospectus [Line Items] | |
| Risk [Text Block] | Sector Risk. To the extent the Fund invests more heavily in particular sectors of the economy, its performance will be especially sensitive to developments that significantly affect those sectors. ◦Information Technology Sector Risk. Market or economic factors impacting information technology companies and companies that rely heavily on technological advances could have a significant effect on the value of the Fund’s investments. The value of stocks of information technology companies and companies that rely heavily on technology is particularly vulnerable to rapid changes in technology product cycles, rapid product obsolescence, government regulation and competition, both domestically and internationally, including competition from foreign competitors with lower production costs. Stocks of information technology companies and companies that rely heavily on technology, especially those of smaller, less-seasoned companies, tend to be more volatile than the overall market. Information technology companies are heavily dependent on patent and intellectual property rights, the loss or impairment of which may adversely affect profitability. ◦Industrials Sector Risk. The industrials sector can be significantly affected by, among other things, worldwide economic growth, supply and demand for specific products and services, rapid technological developments, international political and economic developments, environmental issues, tariffs and trade barriers, and tax and governmental regulatory policies. As the demand for, or prices of, industrials increase, the value of the Fund’s investments generally would be expected to also increase. Conversely, declines in the demand for, or prices of, industrials generally would be expected to contribute to declines in the value of such securities. Such declines may occur quickly and without warning and may negatively impact the value of the Fund and your investment.
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| AAM Transformers ETF | Sector Risk, Information Technology Sector Risk Member | |
| Prospectus [Line Items] | |
| Risk [Text Block] | Information Technology Sector Risk. Market or economic factors impacting information technology companies and companies that rely heavily on technological advances could have a significant effect on the value of the Fund’s investments. The value of stocks of information technology companies and companies that rely heavily on technology is particularly vulnerable to rapid changes in technology product cycles, rapid product obsolescence, government regulation and competition, both domestically and internationally, including competition from foreign competitors with lower production costs. Stocks of information technology companies and companies that rely heavily on technology, especially those of smaller, less-seasoned companies, tend to be more volatile than the overall market. Information technology companies are heavily dependent on patent and intellectual property rights, the loss or impairment of which may adversely affect profitability. |
| AAM Transformers ETF | Securities Lending Risk Member | |
| Prospectus [Line Items] | |
| Risk [Text Block] | Securities Lending Risk. The Fund may engage in securities lending. There are certain risks associated with securities lending, including the risk that the borrower may fail to return the securities on a timely basis or even the loss of rights in the collateral deposited by the borrower, if the borrower should fail financially. The Fund could also lose money in the event of a decline in the value of collateral provided for loaned securities or a decline in the value of any investments made with cash collateral. As a result, the Fund may lose money. |
| AAM Transformers ETF | Concentration Risk Member | |
| Prospectus [Line Items] | |
| Risk [Text Block] | Concentration Risk. The Fund’s investments will be concentrated in an industry or group of industries to the extent that the Index is so concentrated. In such event, the value of the Shares may rise and fall more than the value of shares of a fund that invests in securities of companies in a broader range of industries. |
| AAM Transformers ETF | Depositary Receipt Risk Member | |
| Prospectus [Line Items] | |
| Risk [Text Block] | Depositary Receipt Risk. Depositary Receipts involve risks similar to those associated with investments in foreign securities, such as changes in political or economic conditions of other countries and changes in the exchange rates of foreign currencies. Depositary Receipts listed on U.S. exchanges are issued by banks or trust companies and entitle the holder to all dividends and capital gains that are paid out on the underlying foreign shares (“Underlying Shares”). When the Fund invests in Depositary Receipts as a substitute for an investment directly in the Underlying Shares, the Fund is exposed to the risk that the Depositary Receipts may not provide a return that corresponds precisely with that of the Underlying Shares. |
| AAM Transformers ETF | Foreign Markets Risk Member | |
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| Risk [Text Block] | Foreign Markets Risk. Investments in ADRs that provide exposure to non-U.S. securities involve certain risks that may not be present with investments in U.S. securities. For example, the value of non-U.S. securities may be subject to risk of decline due to foreign currency fluctuations or to political or economic instability. Investments in ADRs also may be subject to withholding or other taxes and may be indirectly subject to additional trading, settlement, custodial, and operational risks. These and other factors can make investments in the Fund more volatile and potentially less liquid than other types of investments. |
| AAM Transformers ETF | Index Provider Risk Member | |
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| Risk [Text Block] | Index Provider Risk. There is no assurance that the Index Provider, or any agents that act on its behalf, will compile the Index accurately, or that the Index will be determined, maintained, constructed, reconstituted, rebalanced, composed, calculated or disseminated accurately. The Adviser relies upon the Index Provider and its agents to compile, determine, maintain, construct, reconstitute, rebalance, compose, calculate (or arrange for an agent to calculate), and disseminate the Index accurately. Any losses or costs associated with errors made by the Index Provider or its agents generally will be borne by the Fund and its shareholders. |
| AAM Transformers ETF | Passive Investment Risk Member | |
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| Risk [Text Block] | Passive Investment Risk. The Fund is not actively managed, and its sub-adviser would not sell shares of an equity security due to current or projected underperformance of a security, industry, or sector, unless that security is removed from the Index or the selling of shares of that security is otherwise required upon a reconstitution or rebalancing of the Index in accordance with the Index methodology. |
| AAM Transformers ETF | Tracking Error Risk Member | |
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| Risk [Text Block] | Tracking Error Risk. As with all index funds, the performance of the Fund and the Index may differ for a variety of reasons. For example, the Fund incurs operating expenses and portfolio transaction costs not incurred by the Index. In addition, the Fund may not be fully invested in the securities of the Index at all times or may hold securities not included in the Index. The Fund may use a representative sampling strategy to achieve its investment objective, if the Fund’s Sub-Adviser believes it is in the best interest of the Fund, which generally can be expected to produce a greater non-correlation risk. |
| AAM Transformers ETF | Sector Risk, Industrials Sector Risk Member | |
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| Risk [Text Block] | Industrials Sector Risk. The industrials sector can be significantly affected by, among other things, worldwide economic growth, supply and demand for specific products and services, rapid technological developments, international political and economic developments, environmental issues, tariffs and trade barriers, and tax and governmental regulatory policies. As the demand for, or prices of, industrials increase, the value of the Fund’s investments generally would be expected to also increase. Conversely, declines in the demand for, or prices of, industrials generally would be expected to contribute to declines in the value of such securities. Such declines may occur quickly and without warning and may negatively impact the value of the Fund and your investment. |
| AAM Transformers ETF | Models And Data Risk Member | |
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| Risk [Text Block] | Models and Data Risk. The composition of the Index is heavily dependent on proprietary quantitative models as well as information and data supplied by third parties (“Models and Data”). When Models and Data prove to be incorrect or incomplete, any decisions made in reliance thereon may lead to securities being included in or excluded from the Index that would have been excluded or included had the Models and Data been correct and complete. If the composition of the Index reflects such errors, the Fund’s portfolio can be expected to reflect the errors, too. |
| AAM Transformers ETF | Risk Lose Money [Member] | |
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| Risk [Text Block] | As with any investment, there is a risk that you could lose all or a portion of your investment in the Fund. |