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The Acquirers Fund  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk/Return [Heading] rr_RiskReturnHeading The Acquirers Fund
Supplement to Prospectus [Text Block] rr_SupplementToProspectusTextBlock
The Acquirers Fund (ZIG)
(the “Fund”)

April 16, 2024

Supplement to the Summary Prospectus, Prospectus,
and Statement of Additional Information, each dated August 31, 2023

Effective May 1, 2024, the management fee for the Fund has been reduced to an annual rate of 0.79% of the Fund’s average daily net assets. All references to the Fund’s management fee in the Fund’s Summary Prospectus, Prospectus, and Statement of Additional Information are revised to reflect the reduced amount.

The following information replaces the sections of the Summary Prospectus and Prospectus entitled “Fees and Expenses of the Fund” and “Expense Example”:
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)
Expenses Restated to Reflect Current [Text] rr_ExpensesRestatedToReflectCurrent Restated to reflect current fees and expenses.
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:
Supplement Closing ck0001540305_SupplementClosing
Please retain this Supplement with your Summary Prospectus, Prospectus,
and Statement of Additional Information for future reference.
The Acquirers Fund | The Acquirers Fund  
Prospectus [Line Items] rr_ProspectusLineItems  
Trading Symbol dei_TradingSymbol ZIG
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets 0.79% [1]
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 0.79%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 81
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 252
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 439
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 978
[1] Restated to reflect current fees and expenses.