v3.26.1
Expense Example
Apr. 30, 2026
USD ($)
Gabelli Growth Innovators ETF | Gabelli Growth Innovators ETF  
Prospectus [Line Items]  
Expense Example, with Redemption, 1 Year $ 0
Expense Example, with Redemption, 3 Years 202
Expense Example, with Redemption, 5 Years 420
Expense Example, with Redemption, 10 Years 1,047
Gabelli Love Our Planet & People ETF | Gabelli Love Our Planet & People ETF  
Prospectus [Line Items]  
Expense Example, with Redemption, 1 Year 92
Expense Example, with Redemption, 3 Years 288
Expense Example, with Redemption, 5 Years 500
Expense Example, with Redemption, 10 Years 1,110
Gabelli Global Technology Leaders ETF | Gabelli Global Technology Leaders ETF  
Prospectus [Line Items]  
Expense Example, with Redemption, 1 Year 0
Expense Example, with Redemption, 3 Years 202
Expense Example, with Redemption, 5 Years 420
Expense Example, with Redemption, 10 Years 1,047
Gabelli Commercial Aerospace and Defense ETF | Gabelli Commercial Aerospace and Defense ETF  
Prospectus [Line Items]  
Expense Example, with Redemption, 1 Year 10
Expense Example, with Redemption, 3 Years 206
Expense Example, with Redemption, 5 Years 419
Expense Example, with Redemption, 10 Years 1,034
Gabelli Financial Services Opportunities ETF | Gabelli Financial Services Opportunities ETF  
Prospectus [Line Items]  
Expense Example, with Redemption, 1 Year 126
Expense Example, with Redemption, 3 Years 478
Expense Example, with Redemption, 5 Years 854
Expense Example, with Redemption, 10 Years 1,909
Gabelli High Income ETF | Gabelli High Income ETF  
Prospectus [Line Items]  
Expense Example, with Redemption, 1 Year 1
Expense Example, with Redemption, 3 Years 124
Expense Example, with Redemption, 5 Years 258
Expense Example, with Redemption, 10 Years 649
Keeley Dividend ETF | Keeley Dividend ETF  
Prospectus [Line Items]  
Expense Example, with Redemption, 1 Year 0
Expense Example, with Redemption, 3 Years 196
Expense Example, with Redemption, 5 Years 410
Expense Example, with Redemption, 10 Years 1,025
Gabelli Opportunities in Live and Sports ETF | Gabelli Opportunities in Live and Sports ETF  
Prospectus [Line Items]  
Expense Example, with Redemption, 1 Year 0
Expense Example, with Redemption, 3 Years 196
Expense Example, with Redemption, 5 Years 410
Expense Example, with Redemption, 10 Years 1,025
Gabelli Equity Income ETF | Gabelli Equity Income ETF  
Prospectus [Line Items]  
Expense Example, with Redemption, 1 Year 0
Expense Example, with Redemption, 3 Years 197
Gabelli Small & Mid Cap ETF | Gabelli Small & Mid Cap ETF  
Prospectus [Line Items]  
Expense Example, with Redemption, 1 Year 92
Expense Example, with Redemption, 3 Years 287
Gabelli Micro Cap ETF | Gabelli Micro Cap ETF  
Prospectus [Line Items]  
Expense Example, with Redemption, 1 Year 92
Expense Example, with Redemption, 3 Years 287
Gabelli Green Energy ETF | Gabelli Green Energy ETF  
Prospectus [Line Items]  
Expense Example, with Redemption, 1 Year 92
Expense Example, with Redemption, 3 Years $ 287