Average Annual Return, Caption Average Annual Return, Caption Strategy Narrative [Text Block] Strategy Narrative [Text Block] Share Classes Share Classes Performance Additional Market Index [Text] Performance Additional Market Index [Text] Annual Return, Inception Date Annual Return, Inception Date Annual Return 2005 Annual Return 2005 Expense Example by Year [Heading] Expense Example by Year [Heading] Annual Return 2006 Annual Return 2006 Annual Return 2003 Annual Return 2003 Annual Return 2004 Annual Return 2004 Annual Return 2009 Annual Return 2009 Document Effective Date Document Effective Date Annual Return 2007 Annual Return 2007 Annual Return 2008 Annual Return 2008 Performance Table Footnotes, Reason Performance Information for Class Different from Immediately Preceding Period [Text] Performance Table Footnotes, Reason Performance Information for Class Different from Immediately Preceding Period [Text] Objective, Primary [Text Block] Objective, Primary [Text Block] Performance Table Heading Performance Table Heading Supplement Closing [Text Block] Supplement Closing Supplement Closing Portfolio Turnover [Heading] Portfolio Turnover [Heading] Expense Example, No Redemption, By Year, Caption [Text] Expense Example, No Redemption, By Year, Caption [Text] Component1 Other Expenses Component1 Other Expenses Risk Money Market Fund Sponsor May Not Provide Support [Member] Risk Money Market Fund Sponsor May Not Provide Support [Member] Maximum Account Fee Maximum Account Fee Shareholder Fee, Other Shareholder Fee, Other Expenses Range of Exchange Fees [Text Block] Expenses Range of Exchange Fees [Text Block] After Taxes on Distributions After Taxes on Distributions Annual Return 2001 Annual Return 2001 Highest Quarterly Return Highest Quarterly Return Annual Return 2002 Annual Return 2002 Annual Return 2000 Annual Return 2000 Annual Return 2016 Annual Return 2016 Coregistrant [Axis] Coregistrant [Axis] Annual Return 2017 Annual Return 2017 Annual Return 2014 Annual Return 2014 Annual Return 2015 Annual Return 2015 Expense Example by, Year, Caption [Text] Expense Example by, Year, Caption [Text] Annual Return 2018 Annual Return 2018 REIT Investment Risk Member REIT Investment Risk Member REIT Investment Risk Member Annual Return 2019 Annual Return 2019 Management Fees (as a percentage of Assets) Management Fees (as a percentage of Assets) Performance Table Does Reflect Sales Loads Performance Table Does Reflect Sales Loads Annual Return 2012 Annual Return 2012 Shareholder Fees Column [Text] Shareholder Fees Column [Text] Annual Return 2013 Annual Return 2013 Fee Waiver or Reimbursement over Assets, Date of Termination Fee Waiver or Reimbursement over Assets, Date of Termination Exchange Fee Exchange Fee Bar Chart, Year to Date Return, Date Bar Chart, Year to Date Return, Date Annual Return 2010 Annual Return 2010 Annual Return 2011 Annual Return 2011 Annual Return 2025 Annual Return 2025 Trading Symbol Trading Symbol Risk Footnotes [Text Block] Risk Footnotes [Text Block] Document Creation Date Document Creation Date Operating Expenses Column [Text] Operating Expenses Column [Text] Maximum Deferred Sales Charge (as a percentage) Maximum Deferred Sales Charge (as a percentage) Management Risk Member Management Risk Member Management Risk Member Document [Axis] Document [Axis] Bar Chart, Returns for Class Not Offered in Prospectus [Text] Bar Chart, Returns for Class Not Offered in Prospectus [Text] Coregistrant [Domain] Coregistrant [Domain] Annual Return 2020 Annual Return 2020 Inception Date Inception Date Annual Return 2023 Annual Return 2023 Annual Return 2024 Annual Return 2024 Average Annual Return, Column Name Average Annual Return, Column Name Annual Return 2021 Annual Return 2021 Sector Risk, Financial Sector Risk Member Sector Risk, Financial Sector Risk Member Sector Risk, Financial Sector Risk Member Performance Table Footnotes Performance Table Footnotes Annual Return 2022 Annual Return 2022 Bar Chart Footnotes [Text Block] Bar Chart Footnotes [Text Block] Redemption Fee Redemption Fee Maximum Cumulative Sales Charge (as a percentage) Maximum Cumulative Sales Charge (as a percentage) Lowest Quarterly Return, Label Lowest Quarterly Return, Label Before Taxes Before Taxes ETF Risks, Trading Risk Member ETF Risks, Trading Risk Member ETF Risks, Trading Risk Member AAM Bahl & Gaynor Small/Mid Cap Income Growth ETF AAM Bahl & Gaynor Small/Mid Cap Income Growth ETF Class AAM Bahl & Gaynor Small/Mid Cap Income Growth ETF Class, C000228893, SMIG Risk Closing [Text Block] Risk Closing [Text Block] Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price) Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price) Strategy Portfolio Concentration [Text] Strategy Portfolio Concentration [Text] Annual Return 1994 Annual Return 1994 Annual Return 1995 Annual Return 1995 Annual Return 1992 Annual Return 1992 Annual Return 1993 Annual Return 1993 Annual Return 1998 Annual Return 1998 Expenses Other Expenses Had Extraordinary Expenses Been Included [Text] Expenses Other Expenses Had Extraordinary Expenses Been Included [Text] Annual Return 1999 Annual Return 1999 Annual Return 1996 Annual Return 1996 Risk Money Market Fund May Not Preserve Dollar [Member] Risk Money Market Fund May Not Preserve Dollar [Member] Annual Return 1997 Annual Return 1997 Expenses Restated to Reflect Current [Text] Expenses Restated to Reflect Current [Text] Bar Chart Closing [Text Block] Bar Chart Closing [Text Block] Thirty Day Yield Column [Text] Thirty Day Yield Column [Text] Acquired Fund Fees and Expenses Acquired Fund Fees and Expenses Risk/Return [Heading] Risk/Return [Heading] Thirty Day Yield Caption Thirty Day Yield Caption Money Market Seven Day Yield Money Market Seven Day Yield Annual Return 1990 Annual Return 1990 Annual Return 1991 Annual Return 1991 Distribution or Similar (Non 12b-1) Fees Distribution or Similar (Non 12b-1) Fees Russell 2500 Total Return Index (reflects no deduction for fees, expenses, or taxes) Russell 2500 Total Return Index (reflects no deduction for fees, expenses, or taxes) Russell 2500 Total Return Index (reflects no deduction for fees, expenses, or taxes) Component3 Other Expenses Component3 Other Expenses Other Expenses, New Fund, Based on Estimates [Text] Other Expenses, New Fund, Based on Estimates [Text] Expense Breakpoint Discounts [Text] Expense Breakpoint Discounts [Text] Index No Deduction for Fees, Expenses, Taxes [Text] Index No Deduction for Fees, Expenses, Taxes [Text] Expenses Represent Both Master and Feeder [Text] Expenses Represent Both Master and Feeder [Text] Maximum Deferred Sales Charge (as a percentage of Offering Price) Maximum Deferred Sales Charge (as a percentage of Offering Price) Annual Return, Column [Text] Annual Return, Column [Text] Performance Past Does Not Indicate Future [Text] Performance Past Does Not Indicate Future [Text] Exchange Fee (as a percentage of Amount Redeemed) Exchange Fee (as a percentage of Amount Redeemed) AAM Bahl & Gaynor Small/Mid Cap Income Growth ETF AAM Bahl & Gaynor Small/Mid Cap Income Growth ETF AAM Bahl & Gaynor Small/Mid Cap Income Growth ETF, S000072560 Share Class [Axis] Share Class [Axis] Performance Table Closing [Text Block] Performance Table Closing [Text Block] Operating Expenses Caption [Text] Operating Expenses Caption [Text] Maximum Account Fee (as a percentage of Assets) Maximum Account Fee (as a percentage of Assets) Performance Narrative [Text Block] Performance Narrative [Text Block] Money Market Seven Day Yield, Caption [Text] Money Market Seven Day Yield, Caption [Text] Performance Table Market Index Changed Performance Table Market Index Changed Entity Inv Company Type Entity Inv Company Type Expense Example, No Redemption, 10 Years Expense Example, No Redemption, 10 Years Thirty Day Tax Equivalent Yield Thirty Day Tax Equivalent Yield Redemption Fee (as a percentage of Amount Redeemed) Redemption Fee (as a percentage of Amount Redeemed) 1 Year 1 Year Lowest Quarterly Return Lowest Quarterly Return Expense Example, No Redemption, 5 Years Expense Example, No Redemption, 5 Years 5 Years 5 Years Thirty Day Yield Thirty Day Yield Prospectus Prospectus Other Expenses (as a percentage of Assets): Other Expenses (as a percentage of Assets): Risk [Text Block] Risk [Text Block] After Taxes on Distributions and Sales After Taxes on Distributions and Sales Expense Narrative [Text Block] Expense Narrative [Text Block] Prospectus [Line Items] Prospectus [Line Items] Performance Measure [Axis] Performance Measure [Axis] Maximum Cumulative Sales Charge (as a percentage of Offering Price) Maximum Cumulative Sales Charge (as a percentage of Offering Price) Sector Risk Member Sector Risk Member Sector Risk Member Risk Money Market Fund May Impose Fees or Suspend Sales [Member] Risk Money Market Fund May Impose Fees or Suspend Sales [Member] Component2 Other Expenses Component2 Other Expenses ETF Risks, Shares May Trade At Prices Other Than NAV Risk Member ETF Risks, Shares May Trade At Prices Other Than NAV Risk Member ETF Risks, Shares May Trade At Prices Other Than NAV Risk Member ETF Risks, Authorized Participants, Market Makers, And Liquidity Providers Concentration Risk Member ETF Risks, Authorized Participants, Market Makers, And Liquidity Providers Concentration Risk Member ETF Risks, Authorized Participants, Market Makers, And Liquidity Providers Concentration Risk Member 10 Years 10 Years Document Type Document Type Risk Not Insured Depository Institution [Member] Risk Not Insured Depository Institution [Member] Depositary Receipt Risk Member Depositary Receipt Risk Member Depositary Receipt Risk Member Strategy [Heading] Strategy [Heading] Registrant Name Registrant Name Bar Chart Does Not Reflect Sales Loads [Text] Bar Chart Does Not Reflect Sales Loads [Text] Net Expenses Net Expenses (as a percentage of Assets) Risk Lose Money [Member] Risk Lose Money [Member] Performance Table Not Relevant to Tax Deferred Performance Table Not Relevant to Tax Deferred Foreign Markets Risk Member Foreign Markets Risk Member Foreign Markets Risk Member Distribution and Service (12b-1) Fees Distribution and Service (12b-1) Fees Document Period End Date Document Period End Date Performance Information Illustrates Variability of Returns [Text] Performance Information Illustrates Variability of Returns [Text] Expense Example, with Redemption, 5 Years Expense Example, with Redemption, 5 Years Entity Central Index Key Entity Central Index Key Expense Example, with Redemption, 3 Years Expense Example, with Redemption, 3 Years ETF Risks Member ETF Risks Member ETF Risks Member Expense Example, with Redemption, 1 Year Expense Example, with Redemption, 1 Year Expenses Deferred Charges [Text Block] Expenses Deferred Charges [Text Block] Risk [Axis] Risk [Axis] Portfolio Turnover [Text Block] Portfolio Turnover [Text Block] Portfolio Turnover, Rate Portfolio Turnover, Rate ETF Risks, Costs Of Buying Or Selling Shares Risk Member ETF Risks, Costs Of Buying Or Selling Shares Risk Member ETF Risks, Costs Of Buying Or Selling Shares Risk Member Year to Date Return, Label Year to Date Return, Label Expense Example Narrative [Text Block] Expense Example Narrative [Text Block] Expense Example, with Redemption, 10 Years Expense Example, with Redemption, 10 Years All Risks [Member] All Risks [Member] Series Series Amendment Flag Amendment Flag Money Market Seven Day Yield Phone Money Market Seven Day Yield Phone Acquired Fund Fees and Expenses, Based on Estimates [Text] Acquired Fund Fees and Expenses, Based on Estimates [Text] Series [Axis] Series [Axis] Expense Example [Heading] Expense Example [Heading] Sector Risk, Industrials Sector Risk Member Sector Risk, Industrials Sector Risk Member Sector Risk, Industrials Sector Risk Member Equity Market Risk Member Equity Market Risk Member Equity Market Risk Member Risk [Heading] Risk [Heading] Expense Example, No Redemption Narrative [Text Block] Expense Example, No Redemption Narrative [Text Block] Dividend-Paying Securities Risk Member Dividend-Paying Securities Risk Member Dividend-Paying Securities Risk Member Thirty Day Yield Phone Thirty Day Yield Phone Performance Table Uses Highest Federal Rate Performance Table Uses Highest Federal Rate Money Market Seven Day Yield Column [Text] Money Market Seven Day Yield Column [Text] Bar Chart and Performance Table [Heading] Bar Chart and Performance Table [Heading] Shareholder Fees Caption [Text] Shareholder Fees Caption [Text] Risk Not Insured [Member] Risk Not Insured [Member] Expense Footnotes [Text Block] Expense Footnotes [Text Block] Performance Table One Class of after Tax Shown [Text] Performance Table One Class of after Tax Shown [Text] Maximum Sales Charge on Reinvested Dividends and Distributions (as a percentage) Maximum Sales Charge on Reinvested Dividends and Distributions (as a percentage) Money Market Seven Day Tax Equivalent Yield Money Market Seven Day Tax Equivalent Yield Fee Waiver or Reimbursement Fee Waiver or Reimbursement Risk Money Market Fund Price Fluctuates [Member] Risk Money Market Fund Price Fluctuates [Member] Prospectus Date Prospectus Date Expenses (as a percentage of Assets) Expenses (as a percentage of Assets) Bar Chart, Reason Selected Class Different from Immediately Preceding Period [Text] Bar Chart, Reason Selected Class Different from Immediately Preceding Period [Text] S&P 500® Index (reflects no deduction for fees, expenses, or taxes) S&P 500® Index (reflects no deduction for fees, expenses, or taxes) S&P 500® Index (reflects no deduction for fees, expenses, or taxes) Expense Example Footnotes [Text Block] Expense Example Footnotes [Text Block] Lowest Quarterly Return, Date Lowest Quarterly Return, Date Prospectus: Prospectus: Legal Entity Identifier Legal Entity Identifier Risk/Return: Risk/Return: Performance Table Narrative Performance Table Narrative Highest Quarterly Return, Date Highest Quarterly Return, Date Amendment Description Amendment Description Expenses Explanation of Nonrecurring Account Fee [Text] Expenses Explanation of Nonrecurring Account Fee [Text] Supplement to Prospectus [Text Block] Supplement to Prospectus [Text Block] Performance Availability Phone [Text] Performance Availability Phone [Text] Bar Chart, Year to Date Return Bar Chart, Year to Date Return Market Capitalization Risk Member Market Capitalization Risk Member Market Capitalization Risk Member Expense [Heading] Expense [Heading] Since Inception Since Inception Annual Return Caption [Text] Annual Return Caption [Text] Performance One Year or Less [Text] Performance One Year or Less [Text] Objective [Heading] Objective [Heading] Performance Table Explanation after Tax Higher Performance Table Explanation after Tax Higher Expense Breakpoint, Minimum Investment Required [Amount] Expense Breakpoint, Minimum Investment Required [Amount] Expense Example, No Redemption, 3 Years Expense Example, No Redemption, 3 Years Expense Example, No Redemption, 1 Year Expense Example, No Redemption, 1 Year Bar Chart Narrative [Text Block] Bar Chart Narrative [Text Block] Highest Quarterly Return, Label Highest Quarterly Return, Label Label Label Performance Availability Website Address [Text] Performance Availability Website Address [Text] Objective, Secondary [Text Block] Objective, Secondary [Text Block] Expenses Not Correlated to Ratio Due to Acquired Fund Fees [Text] Expenses Not Correlated to Ratio Due to Acquired Fund Fees [Text] Bar Chart [Heading] Bar Chart [Heading] Expense Example Closing [Text Block] Expense Example Closing [Text Block]