Investment Risks - U.S. Global GO GOLD and Precious Metal Miners ETF	Dec. 30, 2025
Currency Exchange Rate Risk Member
Prospectus [Line Items]
Risk [Text Block]	Currency Exchange Rate Risk. The Fund invests primarily in investments denominated in non-U.S. currencies or in securities that provide exposure to such 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.
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.
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. Less information may be available about companies in emerging markets than in developed markets because such emerging markets companies may not be subject to accounting, auditing and financial reporting standards or to other regulatory practices required by U.S. companies.
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.
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 and discounts greater than those of domestic ETFs. ◦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.
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.
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.
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 and discounts greater than those of domestic ETFs.
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.
Foreign Securities Risk Member
Prospectus [Line Items]
Risk [Text Block]	Foreign Securities Risk. Investments in non-U.S. securities involve certain risks that may not be present with investments in U.S. securities. For example, investments in non-U.S. securities may be subject to risk of loss due to foreign currency fluctuations or to political or economic instability. There may be less information publicly available about a non-U.S. issuer than a U.S. issuer. Investments in non-U.S. securities also may be subject to withholding or other taxes and may be 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.
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 outside the United States or lists and trades its shares on a foreign exchange, it is more likely to be impacted by events or conditions affecting that country or region. ◦Australia-Specific Risk. Because investments in the metals and mining industry may be geographically concentrated in Australian companies or companies that have a significant presence in Australia, investment results could be dependent on the financial condition of the Australian economy. Investments in Australian issuers may subject the Fund to regulatory, political, currency, security, and economic risk specific to Australia. The Australian economy is heavily dependent on exports from the agricultural and mining sectors. This makes the Australian economy susceptible to fluctuations in the commodity markets. Australia is also dependent on trading with key trading partners. ◦Canada-Specific Risk. Because investments in the metals and mining industry may be geographically concentrated in Canadian companies or companies that have a significant presence in Canada, investment results could be dependent on the financial condition of the Canadian economy. The Canadian economy is reliant on the sale of natural resources and commodities, which can pose risks such as the fluctuation of prices and the variability of demand for exportation of such products. Changes in spending on Canadian products by the economies of other countries or changes in any of these economies may cause a significant impact on the Canadian economy. In particular, the United States is Canada’s largest trading partner, and the imposition of tariffs on Canadian goods by the United States may have a significant negative impact on the Canadian economy, including its metals and mining industry. ◦South Africa-Specific Risk. South Africa’s economy exhibits characteristics of both a developed country and a developing country and has historically experienced extremely uneven distribution of wealth and income and high rates of unemployment. The securities markets in South Africa are subject to greater risks associated with market volatility, lower market capitalization, lower trading volume, illiquidity, inflation, greater price fluctuations, uncertainty regarding the existence of trading markets, governmental control and heavy regulation of labor and industry. In addition, South Africa’s currency has at times been at risk of devaluation due to inadequate foreign currency reserve. While economic reforms have been enacted in recent periods, there can be no assurance that these reforms will achieve the intended results. Furthermore, adverse social and economic conditions in a neighboring country may have a significant adverse effect on South Africa. Additionally, the agriculture and mining sectors of South Africa’s economy account for a large portion of its exports, and thus the South African economy is susceptible to fluctuations in these commodity markets as well as the imposition of tariffs by key trading partners. South Africa is located in a part of the world that has historically been prone to natural disasters, such as droughts, and is economically sensitive to environmental events. Any such event may adversely impact South Africa’s economy or business operations of companies in South Africa, causing an adverse impact on the value of the Fund.
Geographic Investment Risk, Australia-Specific Risk Member
Prospectus [Line Items]
Risk [Text Block]	Australia-Specific Risk. Because investments in the metals and mining industry may be geographically concentrated in Australian companies or companies that have a significant presence in Australia, investment results could be dependent on the financial condition of the Australian economy. Investments in Australian issuers may subject the Fund to regulatory, political, currency, security, and economic risk specific to Australia. The Australian economy is heavily dependent on exports from the agricultural and mining sectors. This makes the Australian economy susceptible to fluctuations in the commodity markets. Australia is also dependent on trading with key trading partners.
Geographic Investment Risk, Canada-Specific Risk Member
Prospectus [Line Items]
Risk [Text Block]	Canada-Specific Risk. Because investments in the metals and mining industry may be geographically concentrated in Canadian companies or companies that have a significant presence in Canada, investment results could be dependent on the financial condition of the Canadian economy. The Canadian economy is reliant on the sale of natural resources and commodities, which can pose risks such as the fluctuation of prices and the variability of demand for exportation of such products. Changes in spending on Canadian products by the economies of other countries or changes in any of these economies may cause a significant impact on the Canadian economy. In particular, the United States is Canada’s largest trading partner, and the imposition of tariffs on Canadian goods by the United States may have a significant negative impact on the Canadian economy, including its metals and mining industry.
Geographic Investment Risk, South Africa-Specific Risk Member
Prospectus [Line Items]
Risk [Text Block]	South Africa-Specific Risk. South Africa’s economy exhibits characteristics of both a developed country and a developing country and has historically experienced extremely uneven distribution of wealth and income and high rates of unemployment. The securities markets in South Africa are subject to greater risks associated with market volatility, lower market capitalization, lower trading volume, illiquidity, inflation, greater price fluctuations, uncertainty regarding the existence of trading markets, governmental control and heavy regulation of labor and industry. In addition, South Africa’s currency has at times been at risk of devaluation due to inadequate foreign currency reserve. While economic reforms have been enacted in recent periods, there can be no assurance that these reforms will achieve the intended results. Furthermore, adverse social and economic conditions in a neighboring country may have a significant adverse effect on South Africa. Additionally, the agriculture and mining sectors of South Africa’s economy account for a large portion of its exports, and thus the South African economy is susceptible to fluctuations in these commodity markets as well as the imposition of tariffs by key trading partners. South Africa is located in a part of the world that has historically been prone to natural disasters, such as droughts, and is economically sensitive to environmental events. Any such event may adversely impact South Africa’s economy or business operations of companies in South Africa, causing an adverse impact on the value of the Fund.
Gold And Precious Metals Risk Member
Prospectus [Line Items]
Risk [Text Block]	• Gold and Precious Metals Risk. The Fund will be sensitive to changes in, and its performance will depend to a greater extent on, the overall condition of the metals and mining industry. Competitive pressures may have a significant effect on the financial condition of companies in such industry. Also, such companies are highly dependent on the price of certain precious metals. These prices may fluctuate substantially over short periods of time, so the Fund’s Share price may be more volatile than other types of investments. The prices of precious metals rise and fall in response to many factors, including: economic cycles; changes in inflation or expectations about inflation in various countries; interest rates; currency fluctuations; metal sales by governments, central banks, or international agencies; investment speculation; resource availability; fluctuations in industrial and commercial supply and demand; government regulation of the metals and materials industries; and government prohibitions or restrictions on the private ownership of certain precious and rare metals. The Fund measures the performance of equity securities of Precious Metals Companies and does not measure the performance of direct investment in precious metals. Consequently, the Fund’s Share price may not move in the same direction and to the same extent as the spot prices of precious metals.
High Portfolio Turnover Risk Member
Prospectus [Line Items]
Risk [Text Block]	High Portfolio Turnover Risk. Because the Fund may “turn over” some or all of its positions as frequently as daily, the Fund may incur high levels of transaction costs from commissions or mark-ups in the bid/offer spread. 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.
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.
Market Capitalization Risk Member
Prospectus [Line Items]
Risk [Text Block]	Market Capitalization Risk. ◦Large-Capitalization Investing Risk. The Fund may invest in the securities of large-capitalization companies. 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 Fund may invest in the securities of mid-capitalization companies. As a result, the Fund may be more volatile than funds that invest in larger, more established 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, but they may also be subject to slower growth than small-capitalization companies during times of economic expansion. Mid-capitalization companies may be particularly sensitive to changes in interest rates, government regulation, borrowing costs, and earnings. ◦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.
Market Capitalization Risk, Large-Capitalization Investing Risk Member
Prospectus [Line Items]
Risk [Text Block]	Large-Capitalization Investing Risk. The Fund may invest in the securities of large-capitalization companies. 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.
Market Capitalization Risk, Mid-Capitalization Investing Risk Member
Prospectus [Line Items]
Risk [Text Block]	Mid-Capitalization Investing Risk. The Fund may invest in the securities of mid-capitalization companies. As a result, the Fund may be more volatile than funds that invest in larger, more established 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, but they may also be subject to slower growth than small-capitalization companies during times of economic expansion. Mid-capitalization companies may be particularly sensitive to changes in interest rates, government regulation, borrowing costs, and earnings.
Market Capitalization Risk, Small-Capitalization Investing Risk 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.
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.
Significant Exposure Risk Member
Prospectus [Line Items]
Risk [Text Block]	Significant Exposure Risk. The Fund is expected to have significant investment exposure (i.e., hold more than 25% of its total assets) in securities issued by companies in the metals and mining industry. As a result, the value of the Fund’s 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. In addition, at times, the metals and mining industry may be out of favor and underperform other industries or groups of industries or the market as a whole.
Tax Risk Member
Prospectus [Line Items]
Risk [Text Block]	• Tax Risk. To qualify for the favorable tax treatment generally available to a regulated investment company (a “RIC”) within the meaning of Subchapter M of the Internal Revenue Code of 1986, as amended (the “Code”), the Fund must satisfy, among other requirements described in the SAI, certain diversification requirements. Given the concentration of the Fund’s investments in a relatively small number of securities, it may not always be possible for the Fund to fully implement its investment strategy while satisfying these diversification requirements. The Fund’s efforts to pursue its investment strategy may cause it inadvertently to fail to satisfy the diversification requirements. If the Fund were to fail to satisfy the diversification requirements, it could be eligible for relief provisions if the failure is due to reasonable cause and not willful neglect and if a penalty tax is paid with respect to each failure to satisfy the applicable requirements. Additionally, relief is provided for certain de minimis failures of the diversification requirements where the Fund corrects the failure within a specified period. If the Fund were to fail to qualify as a RIC for a tax year, and the relief provisions are not available, it would be taxed in the same manner as an ordinary corporation, and distributions to its shareholders would not be deductible by the Fund in computing its taxable income. In such case, its shareholders would be taxed as if they received ordinary dividends, although corporate shareholders could be eligible for the dividends received deduction (subject to certain limitations) and individuals may be able to benefit from the lower tax rates available to qualified dividend income. In addition, the Fund could be required to recognize unrealized gains, pay substantial taxes and interest, and make substantial distributions before requalifying as a RIC.
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.
Risk Nondiversified Status [Member]
Prospectus [Line Items]
Risk [Text Block]	Non-Diversification Risk. The Fund is considered to be non-diversified, which means that it may invest more of its assets in the securities of a single issuer or a smaller number of issuers than if it were a diversified fund. As a result, the Fund may be more exposed to the risks associated with and developments affecting an individual issuer or a smaller number of issuers than a fund that invests more widely. This may increase the Fund’s volatility and cause the performance of a relatively smaller number of issuers to have a greater impact on the Fund’s performance. However, the Fund intends to satisfy the diversification requirements for qualifying as a RIC under Subchapter M of the Code.

Investment Risks - U.S. Global GO GOLD and Precious Metal Miners ETF

Dec. 30, 2025

Currency Exchange Rate Risk. The Fund invests primarily in investments denominated in non-U.S. currencies or in securities that provide exposure to such 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.

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.

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. Less information may be available about companies in emerging markets than in developed markets because such emerging markets companies may not be subject to accounting, auditing and financial reporting standards or to other regulatory practices required by U.S. companies.

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.

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 and discounts greater than those of domestic ETFs.

◦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.

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.

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.

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 and discounts greater than those of domestic ETFs.

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.

Foreign Securities Risk Member

Prospectus [Line Items]

Risk [Text Block]

Foreign Securities Risk. Investments in non-U.S. securities involve certain risks that may not be present with investments in U.S. securities. For example, investments in non-U.S. securities may be subject to risk of loss due to foreign currency fluctuations or to political or economic instability. There may be less information publicly available about a non-U.S. issuer than a U.S. issuer. Investments in non-U.S. securities also may be subject to withholding or other taxes and may be 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.

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 outside the United States or lists and trades its shares on a foreign exchange, it is more likely to be impacted by events or conditions affecting that country or region.

◦Australia-Specific Risk. Because investments in the metals and mining industry may be geographically concentrated in Australian companies or companies that have a significant presence in Australia, investment results could be dependent on the financial condition of the Australian economy. Investments in Australian issuers may subject the Fund to regulatory, political, currency, security, and economic risk specific to Australia. The Australian economy is heavily dependent on exports from the agricultural and mining sectors. This makes the Australian economy susceptible to fluctuations in the commodity markets. Australia is also dependent on trading with key trading partners.

◦Canada-Specific Risk. Because investments in the metals and mining industry may be geographically concentrated in Canadian companies or companies that have a significant presence in Canada, investment results could be dependent on the financial condition of the Canadian economy. The Canadian economy is reliant on the sale of natural resources and commodities, which can pose risks such as the fluctuation of prices and the variability of demand for exportation of such products. Changes in spending on Canadian products by the economies of other countries or changes in any of these economies may cause a significant impact on the Canadian economy. In particular, the United States is Canada’s largest trading partner, and the imposition of tariffs on Canadian goods by the United States may have a significant negative impact on the Canadian economy, including its metals and mining industry.

◦South Africa-Specific Risk. South Africa’s economy exhibits characteristics of both a developed country and a developing country and has historically experienced extremely uneven distribution of wealth and income and high rates of unemployment. The securities markets in South Africa are subject to greater risks associated with market volatility, lower market capitalization, lower trading volume, illiquidity, inflation, greater price fluctuations, uncertainty regarding the existence of trading markets, governmental control and heavy regulation of labor and industry. In addition, South Africa’s currency has at times been at risk of devaluation due to inadequate foreign currency reserve. While economic reforms have been enacted in recent periods, there can be no assurance that these reforms will achieve the intended results. Furthermore, adverse social and economic conditions in a neighboring country may have a significant adverse effect on South Africa. Additionally, the agriculture and mining sectors of South Africa’s economy account for a large portion of its exports, and thus the South African economy is susceptible to fluctuations in these commodity markets as well as the imposition of tariffs by key trading partners. South Africa is located in a part of the world that has historically been prone to natural disasters, such as droughts, and is economically sensitive to environmental events. Any such event may adversely impact South Africa’s economy or business operations of companies in South Africa, causing an adverse impact on the value of the Fund.

Geographic Investment Risk, Australia-Specific Risk Member

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Australia-Specific Risk. Because investments in the metals and mining industry may be geographically concentrated in Australian companies or companies that have a significant presence in Australia, investment results could be dependent on the financial condition of the Australian economy. Investments in Australian issuers may subject the Fund to regulatory, political, currency, security, and economic risk specific to Australia. The Australian economy is heavily dependent on exports from the agricultural and mining sectors. This makes the Australian economy susceptible to fluctuations in the commodity markets. Australia is also dependent on trading with key trading partners.

Geographic Investment Risk, Canada-Specific Risk Member

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Canada-Specific Risk. Because investments in the metals and mining industry may be geographically concentrated in Canadian companies or companies that have a significant presence in Canada, investment results could be dependent on the financial condition of the Canadian economy. The Canadian economy is reliant on the sale of natural resources and commodities, which can pose risks such as the fluctuation of prices and the variability of demand for exportation of such products. Changes in spending on Canadian products by the economies of other countries or changes in any of these economies may cause a significant impact on the Canadian economy. In particular, the United States is Canada’s largest trading partner, and the imposition of tariffs on Canadian goods by the United States may have a significant negative impact on the Canadian economy, including its metals and mining industry.

Geographic Investment Risk, South Africa-Specific Risk Member

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South Africa-Specific Risk. South Africa’s economy exhibits characteristics of both a developed country and a developing country and has historically experienced extremely uneven distribution of wealth and income and high rates of unemployment. The securities markets in South Africa are subject to greater risks associated with market volatility, lower market capitalization, lower trading volume, illiquidity, inflation, greater price fluctuations, uncertainty regarding the existence of trading markets, governmental control and heavy regulation of labor and industry. In addition, South Africa’s currency has at times been at risk of devaluation due to inadequate foreign currency reserve. While economic reforms have been enacted in recent periods, there can be no assurance that these reforms will achieve the intended results. Furthermore, adverse social and economic conditions in a neighboring country may have a significant adverse effect on South Africa. Additionally, the agriculture and mining sectors of South Africa’s economy account for a large portion of its exports, and thus the South African economy is susceptible to fluctuations in these commodity markets as well as the imposition of tariffs by key trading partners. South Africa is located in a part of the world that has historically been prone to natural disasters, such as droughts, and is economically sensitive to environmental events. Any such event may adversely impact South Africa’s economy or business operations of companies in South Africa, causing an adverse impact on the value of the Fund.

Gold And Precious Metals Risk Member

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• Gold and Precious Metals Risk. The Fund will be sensitive to changes in, and its performance will depend to a greater extent on, the overall condition of the metals and mining industry. Competitive pressures may have a significant effect on the financial condition of companies in such industry. Also, such companies are highly dependent on the price of certain precious metals. These prices may fluctuate substantially over short periods of time, so the Fund’s Share price may be more volatile than other types of investments. The prices of precious metals rise and fall in response to many factors, including: economic cycles; changes in inflation or expectations about inflation in various countries; interest rates; currency fluctuations; metal sales by governments, central banks, or international agencies; investment speculation; resource availability; fluctuations in industrial and commercial supply and demand; government regulation of the metals and materials industries; and government prohibitions or restrictions on the private ownership of certain precious and rare metals. The Fund measures the performance of equity securities of Precious Metals Companies and does not measure the performance of direct investment in precious metals. Consequently, the Fund’s Share price may not move in the same direction and to the same extent as the spot prices of precious metals.

High Portfolio Turnover Risk Member

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High Portfolio Turnover Risk. Because the Fund may “turn over” some or all of its positions as frequently as daily, the Fund may incur high levels of transaction costs from commissions or mark-ups in the bid/offer spread. 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.

Management Risk Member

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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.

Market Capitalization Risk Member

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Market Capitalization Risk.

◦Large-Capitalization Investing Risk. The Fund may invest in the securities of large-capitalization companies. 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 Fund may invest in the securities of mid-capitalization companies. As a result, the Fund may be more volatile than funds that invest in larger, more established 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, but they may also be subject to slower growth than small-capitalization companies during times of economic expansion. Mid-capitalization companies may be particularly sensitive to changes in interest rates, government regulation, borrowing costs, and earnings.

◦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.

Market Capitalization Risk, Large-Capitalization Investing Risk Member

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Large-Capitalization Investing Risk. The Fund may invest in the securities of large-capitalization companies. 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.

Market Capitalization Risk, Mid-Capitalization Investing Risk Member

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Mid-Capitalization Investing Risk. The Fund may invest in the securities of mid-capitalization companies. As a result, the Fund may be more volatile than funds that invest in larger, more established 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, but they may also be subject to slower growth than small-capitalization companies during times of economic expansion. Mid-capitalization companies may be particularly sensitive to changes in interest rates, government regulation, borrowing costs, and earnings.

Market Capitalization Risk, Small-Capitalization Investing Risk Member

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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.

Securities Lending Risk Member

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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.

Significant Exposure Risk Member

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Significant Exposure Risk. The Fund is expected to have significant investment exposure (i.e., hold more than 25% of its total assets) in securities issued by companies in the metals and mining industry. As a result, the value of the Fund’s 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. In addition, at times, the metals and mining industry may be out of favor and underperform other industries or groups of industries or the market as a whole.

Tax Risk Member

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• Tax Risk. To qualify for the favorable tax treatment generally available to a regulated investment company (a “RIC”) within the meaning of Subchapter M of the Internal Revenue Code of 1986, as amended (the “Code”), the Fund must satisfy, among other requirements described in the SAI, certain diversification requirements. Given the concentration of the Fund’s investments in a

relatively small number of securities, it may not always be possible for the Fund to fully implement its investment strategy while satisfying these diversification requirements. The Fund’s efforts to pursue its investment strategy may cause it inadvertently to fail to satisfy the diversification requirements. If the Fund were to fail to satisfy the diversification requirements, it could be eligible for relief provisions if the failure is due to reasonable cause and not willful neglect and if a penalty tax is paid with respect to each failure to satisfy the applicable requirements. Additionally, relief is provided for certain de minimis failures of the diversification requirements where the Fund corrects the failure within a specified period. If the Fund were to fail to qualify as a RIC for a tax year, and the relief provisions are not available, it would be taxed in the same manner as an ordinary corporation, and distributions to its shareholders would not be deductible by the Fund in computing its taxable income. In such case, its shareholders would be taxed as if they received ordinary dividends, although corporate shareholders could be eligible for the dividends received deduction (subject to certain limitations) and individuals may be able to benefit from the lower tax rates available to qualified dividend income. In addition, the Fund could be required to recognize unrealized gains, pay substantial taxes and interest, and make substantial distributions before requalifying as a RIC.

Risk Lose Money [Member]

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As with any investment, there is a risk that you could lose all or a portion of your investment in the Fund.

Risk Nondiversified Status [Member]

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Non-Diversification Risk. The Fund is considered to be non-diversified, which means that it may invest more of its assets in the securities of a single issuer or a smaller number of issuers than if it were a diversified fund. As a result, the Fund may be more exposed to the risks associated with and developments affecting an individual issuer or a smaller number of issuers than a fund that invests more widely. This may increase the Fund’s volatility and cause the performance of a relatively smaller number of issuers to have a greater impact on the Fund’s performance. However, the Fund intends to satisfy the diversification requirements for qualifying as a RIC under Subchapter M of the Code.