v3.25.4
Expense Example
Jan. 28, 2026
USD ($)
TETON WESTWOOD MIGHTY MITES FUND | TETON WESTWOOD MIGHTY MITES FUND CLASS AAA  
Prospectus [Line Items]  
Expense Example, with Redemption, 1 Year $ 156
Expense Example, with Redemption, 3 Years 484
Expense Example, with Redemption, 5 Years 834
Expense Example, with Redemption, 10 Years 1,824
TETON WESTWOOD MIGHTY MITES FUND | TETON WESTWOOD MIGHTY MITES FUND CLASS A  
Prospectus [Line Items]  
Expense Example, with Redemption, 1 Year 549
Expense Example, with Redemption, 3 Years 864
Expense Example, with Redemption, 5 Years 1,201
Expense Example, with Redemption, 10 Years 2,150
TETON WESTWOOD MIGHTY MITES FUND | TETON WESTWOOD MIGHTY MITES FUND CLASS C  
Prospectus [Line Items]  
Expense Example, with Redemption, 1 Year 331
Expense Example, with Redemption, 3 Years 712
Expense Example, with Redemption, 5 Years 1,219
Expense Example, with Redemption, 10 Years 2,613
TETON WESTWOOD MIGHTY MITES FUND | TETON WESTWOOD MIGHTY MITES FUND Class I  
Prospectus [Line Items]  
Expense Example, with Redemption, 1 Year 130
Expense Example, with Redemption, 3 Years 405
Expense Example, with Redemption, 5 Years 701
Expense Example, with Redemption, 10 Years 1,544
Keeley Small Cap Fund | Keeley Small Cap Fund CLASS AAA  
Prospectus [Line Items]  
Expense Example, with Redemption, 1 Year 127
Expense Example, with Redemption, 3 Years 483
Expense Example, with Redemption, 5 Years 863
Expense Example, with Redemption, 10 Years 1,930
Keeley Small Cap Fund | Keeley Small Cap Fund CLASS A  
Prospectus [Line Items]  
Expense Example, with Redemption, 1 Year 522
Expense Example, with Redemption, 3 Years 864
Expense Example, with Redemption, 5 Years 1,230
Expense Example, with Redemption, 10 Years 2,256
Keeley Small Cap Fund | Keeley Small Cap Fund CLASS C  
Prospectus [Line Items]  
Expense Example, with Redemption, 1 Year 303
Expense Example, with Redemption, 3 Years 712
Expense Example, with Redemption, 5 Years 1,248
Expense Example, with Redemption, 10 Years 2,716
Keeley Small Cap Fund | Keeley Small Cap Fund Class I  
Prospectus [Line Items]  
Expense Example, with Redemption, 1 Year 102
Expense Example, with Redemption, 3 Years 406
Expense Example, with Redemption, 5 Years 732
Expense Example, with Redemption, 10 Years 1,655
TETON Convertible Securities Fund | TETON Convertible Securities Fund CLASS AAA  
Prospectus [Line Items]  
Expense Example, with Redemption, 1 Year 118
Expense Example, with Redemption, 3 Years 579
Expense Example, with Redemption, 5 Years 1,067
Expense Example, with Redemption, 10 Years 2,414
TETON Convertible Securities Fund | TETON Convertible Securities Fund CLASS A  
Prospectus [Line Items]  
Expense Example, with Redemption, 1 Year 513
Expense Example, with Redemption, 3 Years 956
Expense Example, with Redemption, 5 Years 1,425
Expense Example, with Redemption, 10 Years 2,717
TETON Convertible Securities Fund | TETON Convertible Securities Fund CLASS C  
Prospectus [Line Items]  
Expense Example, with Redemption, 1 Year 294
Expense Example, with Redemption, 3 Years 806
Expense Example, with Redemption, 5 Years 1,445
Expense Example, with Redemption, 10 Years 3,161
TETON Convertible Securities Fund | TETON Convertible Securities Fund Class I  
Prospectus [Line Items]  
Expense Example, with Redemption, 1 Year 93
Expense Example, with Redemption, 3 Years 503
Expense Example, with Redemption, 5 Years 939
Expense Example, with Redemption, 10 Years 2,152
TETON WESTWOOD EQUITY FUND | TETON WESTWOOD EQUITY FUND CLASS AAA  
Prospectus [Line Items]  
Expense Example, with Redemption, 1 Year 171
Expense Example, with Redemption, 3 Years 529
Expense Example, with Redemption, 5 Years 912
Expense Example, with Redemption, 10 Years 1,987
TETON WESTWOOD EQUITY FUND | TETON WESTWOOD EQUITY FUND CLASS A  
Prospectus [Line Items]  
Expense Example, with Redemption, 1 Year 564
Expense Example, with Redemption, 3 Years 908
Expense Example, with Redemption, 5 Years 1,276
Expense Example, with Redemption, 10 Years 2,307
TETON WESTWOOD EQUITY FUND | TETON WESTWOOD EQUITY FUND CLASS C  
Prospectus [Line Items]  
Expense Example, with Redemption, 1 Year 346
Expense Example, with Redemption, 3 Years 757
Expense Example, with Redemption, 5 Years 1,295
Expense Example, with Redemption, 10 Years 2,766
TETON WESTWOOD EQUITY FUND | TETON WESTWOOD EQUITY FUND Class I  
Prospectus [Line Items]  
Expense Example, with Redemption, 1 Year 146
Expense Example, with Redemption, 3 Years 453
Expense Example, with Redemption, 5 Years 782
Expense Example, with Redemption, 10 Years 1,714
TETON WESTWOOD BALANCED FUND | TETON WESTWOOD BALANCED FUND CLASS AAA  
Prospectus [Line Items]  
Expense Example, with Redemption, 1 Year 146
Expense Example, with Redemption, 3 Years 453
Expense Example, with Redemption, 5 Years 782
Expense Example, with Redemption, 10 Years 1,714
TETON WESTWOOD BALANCED FUND | TETON WESTWOOD BALANCED FUND CLASS A  
Prospectus [Line Items]  
Expense Example, with Redemption, 1 Year 540
Expense Example, with Redemption, 3 Years 835
Expense Example, with Redemption, 5 Years 1,151
Expense Example, with Redemption, 10 Years 2,046
TETON WESTWOOD BALANCED FUND | TETON WESTWOOD BALANCED FUND CLASS C  
Prospectus [Line Items]  
Expense Example, with Redemption, 1 Year 321
Expense Example, with Redemption, 3 Years 682
Expense Example, with Redemption, 5 Years 1,169
Expense Example, with Redemption, 10 Years 2,513
TETON WESTWOOD BALANCED FUND | TETON WESTWOOD BALANCED FUND Class I  
Prospectus [Line Items]  
Expense Example, with Redemption, 1 Year 120
Expense Example, with Redemption, 3 Years 375
Expense Example, with Redemption, 5 Years 650
Expense Example, with Redemption, 10 Years $ 1,433