Label	Element	Value
AAM Bahl & Gaynor Small/Mid Cap Income Growth ETF
Prospectus [Line Items]	rr_ProspectusLineItems
Risk/Return [Heading]	rr_RiskReturnHeading	AAM BAHL & GAYNOR SMALL/MID CAP INCOME GROWTH ETF
Objective [Heading]	rr_ObjectiveHeading	Investment Objective
Objective, Primary [Text Block]	rr_ObjectivePrimaryTextBlock	The AAM Bahl & Gaynor Small/Mid Cap Income Growth ETF (the “Fund”) seeks current and growing dividend income, downside protection, and long-term capital appreciation.
Expense [Heading]	rr_ExpenseHeading	Fees and Expenses of the Fund
Expense Narrative [Text Block]	rr_ExpenseNarrativeTextBlock	The following table describes the fees and expenses you may pay if you buy, hold, and sell shares of the Fund (“Shares”). You may pay other fees, such as brokerage commissions and other fees to financial intermediaries, which are not reflected in the table and Example below.
Operating Expenses Caption [Text]	rr_OperatingExpensesCaption	Annual Fund Operating Expenses (expenses that you pay each year as a percentage of the value of your investment)
Portfolio Turnover [Heading]	rr_PortfolioTurnoverHeading	Portfolio Turnover
Portfolio Turnover [Text Block]	rr_PortfolioTurnoverTextBlock	The Fund pays transaction costs, such as commissions, when it buys and sells securities (or “turns over” its portfolio). A higher portfolio turnover rate may indicate higher transaction costs and may result in higher taxes when Shares are held in a taxable account. These costs, which are not reflected in annual fund operating expenses or in the Example, affect the Fund’s performance. For the fiscal year ended October 31, 2023, the Fund’s portfolio turnover rate was 19% of the average value of its portfolio.
Portfolio Turnover, Rate	rr_PortfolioTurnoverRate	19.00%
Expense Example [Heading]	rr_ExpenseExampleHeading	Expense Example
Expense Example Narrative [Text Block]	rr_ExpenseExampleNarrativeTextBlock	This Example is intended to help you compare the cost of investing in the Fund with the cost of investing in other funds. The Example assumes that you invest $10,000 in the Fund for the time periods indicated and then continue to hold or redeem all of your Shares at the end of those periods. The Example also assumes that your investment has a 5% return each year and that the Fund’s operating expenses remain the same.
Expense Example by, Year, Caption [Text]	rr_ExpenseExampleByYearCaption	Although your actual costs may be higher or lower, based on these assumptions your costs would be:
Strategy [Heading]	rr_StrategyHeading	Principal Investment Strategies
Strategy Narrative [Text Block]	rr_StrategyNarrativeTextBlock	The Fund is an actively managed exchange-traded fund (“ETF”) that invests in U.S.-listed equity securities of small- and mid-capitalization companies. Under normal circumstances, the Fund will invest at least 80% of its net assets (plus any borrowings for investment purposes) in small- and mid-capitalization companies. The Fund defines a small- or mid-capitalization company as an issuer whose market capitalization at the time of purchase is between $200 million and the market capitalization of the largest company in the Russell 2500 Index (as of December 31, 2023, $19.5 billion). The equity securities held by the Fund must be listed on a U.S. exchange and may include common stocks of U.S. companies, American Depositary Receipts (“ADRs”) (i.e., receipts evidencing ownership of foreign equity securities), and real estate investment trusts (“REITs”). In selecting securities, Bahl & Gaynor, Inc., the Fund’s sub-adviser (the “Sub-Adviser”), employs a bottom‑up approach that considers, among other factors, a company’s historical earnings and dividends growth, as well as its balance sheet and cash flow generation, competitive position, and prospects for future cash flow and dividend growth. Weightings of individual sectors are based on the Sub-Adviser’s assessment of company fundamentals, valuations, and overall economic conditions. The Sub-Adviser targets companies that, in its judgement, have high-quality business models, strong competitive advantages, reasonable valuations, and sound capital allocation policies or approaches. The Sub-Adviser believes that the securities identified using such strategies have the potential to provide improved downside protection relative to the broader equity market. The Sub-Adviser generally sells a security when, in its opinion one or more of the following occurs, among other reasons: 1) the security’s dividend is reduced to what the Sub-Adviser believes is an unacceptable amount per share, 2) the Sub-Adviser believes the company’s fundamentals deteriorate, 3) the Sub-Adviser believes the company’s stock has become a greater weight of the Fund’s portfolio than desired due to market appreciation or other factors, or 4) the Sub-Adviser identifies a more attractive investment opportunity for the Fund.
Strategy Portfolio Concentration [Text]	rr_StrategyPortfolioConcentration	The Fund is an actively managed exchange-traded fund (“ETF”) that invests in U.S.-listed equity securities of small- and mid-capitalization companies. Under normal circumstances, the Fund will invest at least 80% of its net assets (plus any borrowings for investment purposes) in small- and mid-capitalization companies. The Fund defines a small- or mid-capitalization company as an issuer whose market capitalization at the time of purchase is between $200 million and the market capitalization of the largest company in the Russell 2500 Index (as of December 31, 2023, $19.5 billion). The equity securities held by the Fund must be listed on a U.S. exchange and may include common stocks of U.S. companies, American Depositary Receipts (“ADRs”) (i.e., receipts evidencing ownership of foreign equity securities), and real estate investment trusts (“REITs”).
Risk [Heading]	rr_RiskHeading	Principal Investment Risks
Bar Chart and Performance Table [Heading]	rr_BarChartAndPerformanceTableHeading	Performance
Bar Chart [Heading]	rr_BarChartHeading	Calendar Year Total Returns
Bar Chart Closing [Text Block]	rr_BarChartClosingTextBlock	During the period of time shown in the bar chart, the Fund’s highest quarterly return was 11.20% for the quarter ended December 31, 2023, and the lowest quarterly return was -9.05% for the quarter ended March 31, 2022.
Highest Quarterly Return, Label	rr_HighestQuarterlyReturnLabel	highest quarterly return
Highest Quarterly Return, Date	rr_BarChartHighestQuarterlyReturnDate	Dec. 31, 2023
Highest Quarterly Return	rr_BarChartHighestQuarterlyReturn	11.20%
Lowest Quarterly Return, Label	rr_LowestQuarterlyReturnLabel	lowest quarterly return
Lowest Quarterly Return, Date	rr_BarChartLowestQuarterlyReturnDate	Mar. 31, 2022
Lowest Quarterly Return	rr_BarChartLowestQuarterlyReturn	(9.05%)
Performance Table Heading	rr_PerformanceTableHeading	Average Annual Total Returns For the Period Ended December 31, 2023
Performance Table Uses Highest Federal Rate	rr_PerformanceTableUsesHighestFederalRate	After-tax returns are calculated using the historical highest individual federal marginal income tax rates during the period covered by the table above and do not reflect the impact of state and local taxes.
Performance Table Not Relevant to Tax Deferred	rr_PerformanceTableNotRelevantToTaxDeferred	After-tax returns shown are not relevant to investors who hold their Shares through tax-deferred arrangements such as an individual retirement account (“IRA”) or other tax-advantaged accounts.
Performance Table Explanation after Tax Higher	rr_PerformanceTableExplanationAfterTaxHigher	In certain cases, the figure representing “Return After Taxes on Distributions and Sale of Shares” may be higher than the other return figures for the same period. A higher after-tax return results when a capital loss occurs upon redemption and provides an assumed tax deduction that benefits the investor.
Performance Table Closing [Text Block]	rr_PerformanceTableClosingTextBlock	After-tax returns are calculated using the historical highest individual federal marginal income tax rates during the period covered by the table above and do not reflect the impact of state and local taxes. Actual after-tax returns depend on an investor’s tax situation and may differ from those shown. After-tax returns shown are not relevant to investors who hold their Shares through tax-deferred arrangements such as an individual retirement account (“IRA”) or other tax-advantaged accounts. In certain cases, the figure representing “Return After Taxes on Distributions and Sale of Shares” may be higher than the other return figures for the same period. A higher after-tax return results when a capital loss occurs upon redemption and provides an assumed tax deduction that benefits the investor.
AAM Bahl & Gaynor Small/Mid Cap Income Growth ETF \| Risk Lose Money [Member]
Prospectus [Line Items]	rr_ProspectusLineItems
Risk [Text Block]	rr_RiskTextBlock	As with any investment, there is a risk that you could lose all or a portion of your investment in the Fund.
AAM Bahl & Gaynor Small/Mid Cap Income Growth ETF \| Depositary Receipt Risk Member
Prospectus [Line Items]	rr_ProspectusLineItems
Risk [Text Block]	rr_RiskTextBlock	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 Bahl & Gaynor Small/Mid Cap Income Growth ETF \| Dividend-Paying Securities Risk Member
Prospectus [Line Items]	rr_ProspectusLineItems
Risk [Text Block]	rr_RiskTextBlock	Dividend-Paying Securities Risk. There is no guarantee that issuers of the securities held by the Fund will declare dividends in the future or that, if declared, they will either remain at current levels or increase over time.
AAM Bahl & Gaynor Small/Mid Cap Income Growth ETF \| Equity Market Risk Member
Prospectus [Line Items]	rr_ProspectusLineItems
Risk [Text Block]	rr_RiskTextBlock	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, 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 Bahl & Gaynor Small/Mid Cap Income Growth ETF \| ETF Risks Member
Prospectus [Line Items]	rr_ProspectusLineItems
Risk [Text Block]	rr_RiskTextBlock	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. 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 Bahl & Gaynor Small/Mid Cap Income Growth ETF \| ETF Risks, Authorized Participants, Market Makers And Liquidity Providers Concentration Risk Member
Prospectus [Line Items]	rr_ProspectusLineItems
Risk [Text Block]	rr_RiskTextBlock	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 Bahl & Gaynor Small/Mid Cap Income Growth ETF \| ETF Risks, Costs Of Buying Or Selling Shares Risk Member
Prospectus [Line Items]	rr_ProspectusLineItems
Risk [Text Block]	rr_RiskTextBlock	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 Bahl & Gaynor Small/Mid Cap Income Growth ETF \| ETF Risks, Shares May Trade At Prices Other Than NAV Risk Member
Prospectus [Line Items]	rr_ProspectusLineItems
Risk [Text Block]	rr_RiskTextBlock	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 Bahl & Gaynor Small/Mid Cap Income Growth ETF \| ETF Risks, Trading Risk Member
Prospectus [Line Items]	rr_ProspectusLineItems
Risk [Text Block]	rr_RiskTextBlock	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. 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 Bahl & Gaynor Small/Mid Cap Income Growth ETF \| Foreign Markets Risk Member
Prospectus [Line Items]	rr_ProspectusLineItems
Risk [Text Block]	rr_RiskTextBlock	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 Bahl & Gaynor Small/Mid Cap Income Growth ETF \| Management Risk Member
Prospectus [Line Items]	rr_ProspectusLineItems
Risk [Text Block]	rr_RiskTextBlock	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 Bahl & Gaynor Small/Mid Cap Income Growth ETF \| Market Capitalization Risk Member
Prospectus [Line Items]	rr_ProspectusLineItems
Risk [Text Block]	rr_RiskTextBlock	Market Capitalization Risk. The securities of small- and 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 Bahl & Gaynor Small/Mid Cap Income Growth ETF \| REIT Investment Risk Member
Prospectus [Line Items]	rr_ProspectusLineItems
Risk [Text Block]	rr_RiskTextBlock	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 Bahl & Gaynor Small/Mid Cap Income Growth ETF \| Sector Risk Member
Prospectus [Line Items]	rr_ProspectusLineItems
Risk [Text Block]	rr_RiskTextBlock	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. ◦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.
AAM Bahl & Gaynor Small/Mid Cap Income Growth ETF \| Sector Risk, Financial Sector Risk Member
Prospectus [Line Items]	rr_ProspectusLineItems
Risk [Text Block]	rr_RiskTextBlock	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 Bahl & Gaynor Small/Mid Cap Income Growth ETF \| Sector Risk, Industrials Sector Risk Member
Prospectus [Line Items]	rr_ProspectusLineItems
Risk [Text Block]	rr_RiskTextBlock	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 Bahl & Gaynor Small/Mid Cap Income Growth ETF \| Russell 2500 Total Return Index (reflects no deduction for fees, expenses, or taxes)
Prospectus [Line Items]	rr_ProspectusLineItems
Index No Deduction for Fees, Expenses, Taxes [Text]	rr_IndexNoDeductionForFeesExpensesTaxes	(reflects no deduction for fees, expenses, or taxes)
Label	rr_AverageAnnualReturnLabel	Russell 2500 Total Return Index(reflects no deduction for fees, expenses, or taxes)
1 Year	rr_AverageAnnualReturnYear01	17.42%
Since Inception	rr_AverageAnnualReturnSinceInception	(1.14%)
Inception Date	rr_AverageAnnualReturnInceptionDate	Aug. 25, 2021
AAM Bahl & Gaynor Small/Mid Cap Income Growth ETF \| AAM Bahl & Gaynor Small/Mid Cap Income Growth ETF
Prospectus [Line Items]	rr_ProspectusLineItems
Trading Symbol	dei_TradingSymbol	SMIG
Management Fees (as a percentage of Assets)	rr_ManagementFeesOverAssets	0.60%
Distribution and Service (12b-1) Fees	rr_DistributionAndService12b1FeesOverAssets	none
Other Expenses (as a percentage of Assets):	rr_OtherExpensesOverAssets	none
Expenses (as a percentage of Assets)	rr_ExpensesOverAssets	0.60%
Expense Example, with Redemption, 1 Year	rr_ExpenseExampleYear01	$ 61
Expense Example, with Redemption, 3 Years	rr_ExpenseExampleYear03	192
Expense Example, with Redemption, 5 Years	rr_ExpenseExampleYear05	335
Expense Example, with Redemption, 10 Years	rr_ExpenseExampleYear10	$ 750
Annual Return 2022	rr_AnnualReturn2022	(11.74%)
Annual Return 2023	rr_AnnualReturn2023	13.39%
Label	rr_AverageAnnualReturnLabel	Return Before Taxes
1 Year	rr_AverageAnnualReturnYear01	13.39%
Since Inception	rr_AverageAnnualReturnSinceInception	2.07%
Inception Date	rr_AverageAnnualReturnInceptionDate	Aug. 25, 2021
AAM Bahl & Gaynor Small/Mid Cap Income Growth ETF \| AAM Bahl & Gaynor Small/Mid Cap Income Growth ETF \| After Taxes on Distributions
Prospectus [Line Items]	rr_ProspectusLineItems
Label	rr_AverageAnnualReturnLabel	Return After Taxes on Distributions
1 Year	rr_AverageAnnualReturnYear01	12.83%
Since Inception	rr_AverageAnnualReturnSinceInception	1.61%
AAM Bahl & Gaynor Small/Mid Cap Income Growth ETF \| AAM Bahl & Gaynor Small/Mid Cap Income Growth ETF \| After Taxes on Distributions and Sales
Prospectus [Line Items]	rr_ProspectusLineItems
Label	rr_AverageAnnualReturnLabel	Return After Taxes on Distributions and Sale of Fund Shares
1 Year	rr_AverageAnnualReturnYear01	8.26%
Since Inception	rr_AverageAnnualReturnSinceInception	1.55%

Label

Element

Value

AAM Bahl & Gaynor Small/Mid Cap Income Growth ETF

Prospectus [Line Items]

rr_ProspectusLineItems

Risk/Return [Heading]

rr_RiskReturnHeading

AAM BAHL & GAYNOR SMALL/MID CAP INCOME GROWTH ETF

Objective [Heading]

rr_ObjectiveHeading

Investment Objective

Objective, Primary [Text Block]

rr_ObjectivePrimaryTextBlock

The AAM Bahl & Gaynor Small/Mid Cap Income Growth ETF (the “Fund”) seeks current and growing dividend income, downside protection, and long-term capital appreciation.

Expense [Heading]

rr_ExpenseHeading

Fees and Expenses of the Fund

Expense Narrative [Text Block]

rr_ExpenseNarrativeTextBlock

The following table describes the fees and expenses you may pay if you buy, hold, and sell shares of the Fund (“Shares”). You may pay other fees, such as brokerage commissions and other fees to financial intermediaries, which are not reflected in the table and Example below.

Operating Expenses Caption [Text]

rr_OperatingExpensesCaption

Annual Fund Operating Expenses (expenses that you pay each year as a percentage of the value of your investment)

Portfolio Turnover [Heading]

rr_PortfolioTurnoverHeading

Portfolio Turnover

Portfolio Turnover [Text Block]

rr_PortfolioTurnoverTextBlock

The Fund pays transaction costs, such as commissions, when it buys and sells securities (or “turns over” its portfolio). A higher portfolio turnover rate may indicate higher transaction costs and may result in higher taxes when Shares are held in a taxable account. These costs, which are not reflected in annual fund operating expenses or in the Example, affect the Fund’s performance. For the fiscal year ended October 31, 2023, the Fund’s portfolio turnover rate was 19% of the average value of its portfolio.

Portfolio Turnover, Rate

rr_PortfolioTurnoverRate

19.00%

Expense Example [Heading]

rr_ExpenseExampleHeading

Expense Example

Expense Example Narrative [Text Block]

rr_ExpenseExampleNarrativeTextBlock

This Example is intended to help you compare the cost of investing in the Fund with the cost of investing in other funds. The Example assumes that you invest $10,000 in the Fund for the time periods indicated and then continue to hold or redeem all of your Shares at the end of those periods. The Example also assumes that your investment has a 5% return each year and that the Fund’s operating expenses remain the same.

Expense Example by, Year, Caption [Text]

rr_ExpenseExampleByYearCaption

Although your actual costs may be higher or lower, based on these assumptions your costs would be:

Strategy [Heading]

rr_StrategyHeading

Principal Investment Strategies

Strategy Narrative [Text Block]

rr_StrategyNarrativeTextBlock

The Fund is an actively managed exchange-traded fund (“ETF”) that invests in U.S.-listed equity securities of small- and mid-capitalization companies. Under normal circumstances, the Fund will invest at least 80% of its net assets (plus any borrowings for investment purposes) in small- and mid-capitalization companies. The Fund defines a small- or mid-capitalization company as an issuer whose market capitalization at the time of purchase is between $200 million and the market capitalization of the largest company in the Russell 2500 Index (as of December 31, 2023, $19.5 billion). The equity securities held by the Fund must be listed on a U.S. exchange and may include common stocks of U.S. companies, American Depositary Receipts (“ADRs”) (i.e., receipts evidencing ownership of foreign equity securities), and real estate investment trusts (“REITs”).

In selecting securities, Bahl & Gaynor, Inc., the Fund’s sub-adviser (the “Sub-Adviser”), employs a bottom‑up approach that considers, among other factors, a company’s historical earnings and dividends growth, as well as its balance sheet and cash flow generation, competitive position, and prospects for future cash flow and dividend growth. Weightings of individual sectors are based on the Sub-Adviser’s assessment of company fundamentals, valuations, and overall economic conditions. The Sub-Adviser targets companies that, in its judgement, have high-quality business models, strong competitive advantages, reasonable valuations, and sound capital allocation policies or approaches. The Sub-Adviser believes that the securities identified using such strategies have the potential to provide improved downside protection relative to the broader equity market.

The Sub-Adviser generally sells a security when, in its opinion one or more of the following occurs, among other reasons: 1) the security’s dividend is reduced to what the Sub-Adviser believes is an unacceptable amount per share, 2) the Sub-Adviser believes the company’s fundamentals deteriorate, 3) the Sub-Adviser believes the company’s stock has become a greater weight of the Fund’s portfolio than desired due to market appreciation or other factors, or 4) the Sub-Adviser identifies a more attractive investment opportunity for the Fund.

Strategy Portfolio Concentration [Text]

rr_StrategyPortfolioConcentration

Risk [Heading]

rr_RiskHeading

Principal Investment Risks

Bar Chart and Performance Table [Heading]

rr_BarChartAndPerformanceTableHeading

Performance

Bar Chart [Heading]

rr_BarChartHeading

Calendar Year Total Returns

Bar Chart Closing [Text Block]

rr_BarChartClosingTextBlock

During the period of time shown in the bar chart, the Fund’s highest quarterly return was 11.20% for the quarter ended December 31, 2023, and the lowest quarterly return was -9.05% for the quarter ended March 31, 2022.

Highest Quarterly Return, Label

rr_HighestQuarterlyReturnLabel

highest quarterly return

Highest Quarterly Return, Date

rr_BarChartHighestQuarterlyReturnDate

Dec. 31, 2023

Highest Quarterly Return

rr_BarChartHighestQuarterlyReturn

11.20%

Lowest Quarterly Return, Label

rr_LowestQuarterlyReturnLabel

lowest quarterly return

Lowest Quarterly Return, Date

rr_BarChartLowestQuarterlyReturnDate

Mar. 31, 2022

Lowest Quarterly Return

rr_BarChartLowestQuarterlyReturn

(9.05%)

Performance Table Heading

rr_PerformanceTableHeading

Average Annual Total Returns For the Period Ended December 31, 2023

Performance Table Uses Highest Federal Rate

rr_PerformanceTableUsesHighestFederalRate

Performance Table Not Relevant to Tax Deferred

rr_PerformanceTableNotRelevantToTaxDeferred

After-tax returns shown are not relevant to investors who hold their Shares through tax-deferred arrangements such as an individual retirement account (“IRA”) or other tax-advantaged accounts.

Performance Table Explanation after Tax Higher

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In certain cases, the figure representing “Return After Taxes on Distributions and Sale of Shares” may be higher than the other return figures for the same period. A higher after-tax return results when a capital loss occurs upon redemption and provides an assumed tax deduction that benefits the investor.

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After-tax returns are calculated using the historical highest individual federal marginal income tax rates during the period covered by the table above and do not reflect the impact of state and local taxes. Actual after-tax returns depend on an investor’s tax situation and may differ from those shown. After-tax returns shown are not relevant to investors who hold their Shares through tax-deferred arrangements such as an individual retirement account (“IRA”) or other tax-advantaged accounts. In certain cases, the figure representing “Return After Taxes on Distributions and Sale of Shares” may be higher than the other return figures for the same period. A higher after-tax return results when a capital loss occurs upon redemption and provides an assumed tax deduction that benefits the investor.

AAM Bahl & Gaynor Small/Mid Cap Income Growth ETF | 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.

AAM Bahl & Gaynor Small/Mid Cap Income Growth ETF | Depositary Receipt Risk Member

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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 Bahl & Gaynor Small/Mid Cap Income Growth ETF | Dividend-Paying Securities Risk Member

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Dividend-Paying Securities Risk. There is no guarantee that issuers of the securities held by the Fund will declare dividends in the future or that, if declared, they will either remain at current levels or increase over time.

AAM Bahl & Gaynor Small/Mid Cap Income Growth ETF | Equity Market Risk Member

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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, 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 Bahl & Gaynor Small/Mid Cap Income Growth ETF | ETF Risks Member

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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. 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 Bahl & Gaynor Small/Mid Cap Income Growth ETF | ETF Risks, Authorized Participants, Market Makers And Liquidity Providers Concentration Risk Member

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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 Bahl & Gaynor Small/Mid Cap Income Growth ETF | ETF Risks, Costs Of Buying Or Selling Shares Risk Member

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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 Bahl & Gaynor Small/Mid Cap Income Growth ETF | ETF Risks, Shares May Trade At Prices Other Than NAV Risk Member

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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 Bahl & Gaynor Small/Mid Cap Income Growth ETF | ETF Risks, Trading Risk Member

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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. 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 Bahl & Gaynor Small/Mid Cap Income Growth ETF | Foreign Markets Risk Member

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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 Bahl & Gaynor Small/Mid Cap Income Growth ETF | 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.

AAM Bahl & Gaynor Small/Mid Cap Income Growth ETF | Market Capitalization Risk Member

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Market Capitalization Risk. The securities of small- and 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 Bahl & Gaynor Small/Mid Cap Income Growth ETF | REIT Investment Risk Member

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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 Bahl & Gaynor Small/Mid Cap Income Growth ETF | Sector Risk Member

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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.

◦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.

AAM Bahl & Gaynor Small/Mid Cap Income Growth ETF | Sector Risk, Financial Sector Risk Member

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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 Bahl & Gaynor Small/Mid Cap Income Growth ETF | Sector Risk, Industrials Sector Risk Member

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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 Bahl & Gaynor Small/Mid Cap Income Growth ETF | Russell 2500 Total Return Index (reflects no deduction for fees, expenses, or taxes)

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Index No Deduction for Fees, Expenses, Taxes [Text]

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(reflects no deduction for fees, expenses, or taxes)

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Russell 2500 Total Return Index(reflects no deduction for fees, expenses, or taxes)

1 Year

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17.42%