v3.25.4
Annual Total Returns
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Keeley Gabelli Small Cap Dividend Fund Class A                    
Prospectus [Line Items]                    
Annual Return [Percent] [1] 4.93% 15.52% 9.96% (5.76%) 24.69% 3.58% 22.36% (20.33%) 7.27% 29.43%
Keeley Gabelli SMID Cap Value Fund Class A                    
Prospectus [Line Items]                    
Annual Return [Percent] [2] 9.64% 14.06% 19.15% (12.93%) 25.90% 0.63% 31.65% (21.55%) 17.76% 20.64%
Keeley Gabelli Mid Cap Dividend Fund Class A                    
Prospectus [Line Items]                    
Annual Return [Percent] [3] 9.11% 14.86% 12.45% (5.50%) 24.56% (1.77%) 25.61% (16.76%) 15.69% 23.80%
[1] The information in the bar chart represents the performance of the Fund’s Class A Shares. Performance information for the Fund’s Class I Shares is not shown and the performance of that class will be different from the Fund’s Class A Shares because the expenses of each class are different.
[2] The information in the bar chart represents the performance of the Fund’s Class A Shares. Performance information for the Fund’s Class I Shares is not shown and the performance of that class will be different from the Fund’s Class A Shares because the expenses of each class are different.
[3] The information in the bar chart represents the performance of the Fund’s Class A Shares. Performance information for the Fund’s Class I Shares is not shown and the performance of that class will be different from the Fund’s Class A Shares because the expenses of each class are different.