v3.25.4
Expense Example
Jan. 28, 2026
USD ($)
Keeley Gabelli Small Cap Dividend Fund | Keeley Gabelli Small Cap Dividend Fund Class A  
Prospectus [Line Items]  
Expense Example, with Redemption, 1 Year $ 575
Expense Example, with Redemption, 3 Years 880
Expense Example, with Redemption, 5 Years 1,208
Expense Example, with Redemption, 10 Years 2,132
Keeley Gabelli Small Cap Dividend Fund | Keeley Gabelli Small Cap Dividend Fund Class I  
Prospectus [Line Items]  
Expense Example, with Redemption, 1 Year 106
Expense Example, with Redemption, 3 Years 373
Expense Example, with Redemption, 5 Years 661
Expense Example, with Redemption, 10 Years 1,481
Keeley Gabelli SMID Cap Value Fund | Keeley Gabelli SMID Cap Value Fund Class A  
Prospectus [Line Items]  
Expense Example, with Redemption, 1 Year 589
Expense Example, with Redemption, 3 Years 967
Expense Example, with Redemption, 5 Years 1,369
Expense Example, with Redemption, 10 Years 2,489
Keeley Gabelli SMID Cap Value Fund | Keeley Gabelli SMID Cap Value Fund Class I  
Prospectus [Line Items]  
Expense Example, with Redemption, 1 Year 120
Expense Example, with Redemption, 3 Years 464
Expense Example, with Redemption, 5 Years 832
Expense Example, with Redemption, 10 Years 1,865
Keeley Gabelli Mid Cap Dividend Fund | Keeley Gabelli Mid Cap Dividend Fund Class A  
Prospectus [Line Items]  
Expense Example, with Redemption, 1 Year 567
Expense Example, with Redemption, 3 Years 858
Expense Example, with Redemption, 5 Years 1,171
Expense Example, with Redemption, 10 Years 2,057
Keeley Gabelli Mid Cap Dividend Fund | Keeley Gabelli Mid Cap Dividend Fund Class I  
Prospectus [Line Items]  
Expense Example, with Redemption, 1 Year 97
Expense Example, with Redemption, 3 Years 350
Expense Example, with Redemption, 5 Years 623
Expense Example, with Redemption, 10 Years $ 1,401