Shareholder Fees	Apr. 30, 2026 USD ($)
Gabelli Growth Innovators ETF \| Gabelli Growth Innovators ETF
Prospectus [Line Items]
Shareholder Fee, Other	$ 0
Gabelli Love Our Planet & People ETF \| Gabelli Love Our Planet & People ETF
Prospectus [Line Items]
Shareholder Fee, Other	0
Gabelli Global Technology Leaders ETF \| Gabelli Global Technology Leaders ETF
Prospectus [Line Items]
Shareholder Fee, Other	0
Gabelli Commercial Aerospace and Defense ETF \| Gabelli Commercial Aerospace and Defense ETF
Prospectus [Line Items]
Shareholder Fee, Other	0
Gabelli Financial Services Opportunities ETF \| Gabelli Financial Services Opportunities ETF
Prospectus [Line Items]
Shareholder Fee, Other	0
Gabelli High Income ETF \| Gabelli High Income ETF
Prospectus [Line Items]
Shareholder Fee, Other	0
Keeley Dividend ETF \| Keeley Dividend ETF
Prospectus [Line Items]
Shareholder Fee, Other	0
Gabelli Opportunities in Live and Sports ETF \| Gabelli Opportunities in Live and Sports ETF
Prospectus [Line Items]
Shareholder Fee, Other	0
Gabelli Equity Income ETF \| Gabelli Equity Income ETF
Prospectus [Line Items]
Shareholder Fee, Other	0
Gabelli Small & Mid Cap ETF \| Gabelli Small & Mid Cap ETF
Prospectus [Line Items]
Shareholder Fee, Other	0
Gabelli Micro Cap ETF \| Gabelli Micro Cap ETF
Prospectus [Line Items]
Shareholder Fee, Other	0
Gabelli Green Energy ETF \| Gabelli Green Energy ETF
Prospectus [Line Items]
Shareholder Fee, Other	$ 0