v3.26.1
Shareholder Report, Line Graph (Details) - USD ($)
 6 Months Ended 12 Months Ended 24 Months Ended 36 Months Ended 48 Months Ended 60 Months Ended 72 Months Ended 84 Months Ended 96 Months Ended 108 Months Ended 120 Months Ended
Mar. 31, 2016
Mar. 31, 2026
Mar. 31, 2016
Mar. 31, 2017
Mar. 31, 2018
Mar. 31, 2019
Mar. 31, 2020
Mar. 31, 2021
Mar. 31, 2022
Mar. 31, 2023
Mar. 31, 2024
Mar. 31, 2025
Mar. 31, 2026
C000002934                          
Account Value [Line Items]                          
Line Graph and Table Measure Name   Keeley Small Cap Fund - Class AAA                      
C000002933                          
Account Value [Line Items]                          
Line Graph and Table Measure Name   Keeley Small Cap Fund - Class C                      
C000061068                          
Account Value [Line Items]                          
Line Graph and Table Measure Name   Keeley Small Cap Fund - Class I                      
C000002931                          
Account Value [Line Items]                          
Line Graph and Table Measure Name   Keeley Small Cap Fund - Class A                      
C000002912                          
Account Value [Line Items]                          
Line Graph and Table Measure Name     TETON Westwood Balanced Fund - Class AAA                    
C000002914                          
Account Value [Line Items]                          
Line Graph and Table Measure Name     TETON Westwood Balanced Fund - Class C                    
C000061063                          
Account Value [Line Items]                          
Line Graph and Table Measure Name     TETON Westwood Balanced Fund - Class I                    
C000002911                          
Account Value [Line Items]                          
Line Graph and Table Measure Name     TETON Westwood Balanced Fund - Class A                    
C000002922                          
Account Value [Line Items]                          
Line Graph and Table Measure Name     TETON Convertible Securities Fund - Class AAA                    
C000002921                          
Account Value [Line Items]                          
Line Graph and Table Measure Name     TETON Convertible Securities Fund - Class C                    
C000061065                          
Account Value [Line Items]                          
Line Graph and Table Measure Name     TETON Convertible Securities Fund - Class I                    
C000002919                          
Account Value [Line Items]                          
Line Graph and Table Measure Name     TETON Convertible Securities Fund - Class A                    
C000002918                          
Account Value [Line Items]                          
Line Graph and Table Measure Name     TETON Westwood Equity Fund - Class AAA                    
C000002916                          
Account Value [Line Items]                          
Line Graph and Table Measure Name     TETON Westwood Equity Fund - Class C                    
C000061064                          
Account Value [Line Items]                          
Line Graph and Table Measure Name     TETON Westwood Equity Fund - Class I                    
C000002917                          
Account Value [Line Items]                          
Line Graph and Table Measure Name     TETON Westwood Equity Fund - Class A                    
C000002928                          
Account Value [Line Items]                          
Line Graph and Table Measure Name     TETON Westwood Mighty Mites Fund - Class AAA                    
C000002930                          
Account Value [Line Items]                          
Line Graph and Table Measure Name     TETON Westwood Mighty Mites Fund - Class C                    
C000061067                          
Account Value [Line Items]                          
Line Graph and Table Measure Name     TETON Westwood Mighty Mites Fund - Class I                    
C000002927                          
Account Value [Line Items]                          
Line Graph and Table Measure Name     TETON Westwood Mighty Mites Fund - Class A                    
Russell 2000 Index                          
Account Value [Line Items]                          
Accumulated Value $ 10,000     $ 12,622 $ 14,110 $ 14,399 $ 10,945 $ 21,326 $ 20,091 $ 17,759 $ 21,259 $ 20,407 $ 25,655
Russell 2000 Index                          
Account Value [Line Items]                          
Accumulated Value 10,000     12,622 14,110 14,399 10,945 21,326 20,091 17,759 21,259 20,407 25,655
Russell 2000 Index                          
Account Value [Line Items]                          
Accumulated Value 500,000     631,100 705,507 719,970 547,249 1,066,314 1,004,575 887,944 1,062,957 1,020,333 1,282,762
Russell 2000 Index                          
Account Value [Line Items]                          
Accumulated Value 10,000     12,622 14,110 14,399 10,945 21,326 20,091 17,759 21,259 20,407 25,655
S&P 500 Index                          
Account Value [Line Items]                          
Accumulated Value 10,000     11,717 13,356 14,625 13,604 21,270 24,599 22,697 29,479 31,912 37,592
S&P 500 Index                          
Account Value [Line Items]                          
Accumulated Value 10,000     11,717 13,356 14,625 13,604 21,270 24,599 22,697 29,479 31,912 37,592
S&P 500 Index                          
Account Value [Line Items]                          
Accumulated Value 500,000     585,850 667,810 731,252 680,211 1,063,510 1,229,949 1,134,874 1,473,974 1,595,577 1,879,590
S&P 500 Index                          
Account Value [Line Items]                          
Accumulated Value 10,000     11,717 13,356 14,625 13,604 21,270 24,599 22,697 29,479 31,912 37,592
S&P 500 Index                          
Account Value [Line Items]                          
Accumulated Value 10,000     11,717 13,356 14,625 13,604 21,270 24,599 22,697 29,479 31,912 37,592
S&P 500 Index                          
Account Value [Line Items]                          
Accumulated Value 10,000     11,717 13,356 14,625 13,604 21,270 24,599 22,697 29,479 31,912 37,592
S&P 500 Index                          
Account Value [Line Items]                          
Accumulated Value 100,000     117,170 133,562 146,250 136,042 212,702 245,990 226,975 294,795 319,115 375,918
S&P 500 Index                          
Account Value [Line Items]                          
Accumulated Value 10,000     11,717 13,356 14,625 13,604 21,270 24,599 22,697 29,479 31,912 37,592
S&P 500 Index                          
Account Value [Line Items]                          
Accumulated Value 10,000     11,717 13,356 14,625 13,604 21,270 24,599 22,697 29,479 31,912 37,592
S&P 500 Index                          
Account Value [Line Items]                          
Accumulated Value 10,000     11,717 13,356 14,625 13,604 21,270 24,599 22,697 29,479 31,912 37,592
S&P 500 Index                          
Account Value [Line Items]                          
Accumulated Value 500,000     585,850 667,810 731,252 680,211 1,063,510 1,229,949 1,134,874 1,473,974 1,595,577 1,879,590
S&P 500 Index                          
Account Value [Line Items]                          
Accumulated Value 10,000     11,717 13,356 14,625 13,604 21,270 24,599 22,697 29,479 31,912 37,592
Russell 2000 Index                          
Account Value [Line Items]                          
Accumulated Value 10,000     12,622 14,110 14,399 10,945 21,326 20,091 17,759 21,259 20,407 25,655
Russell 2000 Index                          
Account Value [Line Items]                          
Accumulated Value 10,000     12,622 14,110 14,399 10,945 21,326 20,091 17,759 21,259 20,407 25,655
Russell 2000 Index                          
Account Value [Line Items]                          
Accumulated Value 500,000     631,100 705,507 719,970 547,249 1,066,314 1,004,575 887,944 1,062,957 1,020,333 1,282,762
Russell 2000 Index                          
Account Value [Line Items]                          
Accumulated Value 10,000     12,622 14,110 14,399 10,945 21,326 20,091 17,759 21,259 20,407 25,655
Russell 2000 Value Index                          
Account Value [Line Items]                          
Accumulated Value 10,000     12,937 13,601 13,624 9,586 18,889 19,516 16,986 20,171 19,542 25,031
Russell 2000 Value Index                          
Account Value [Line Items]                          
Accumulated Value 10,000     12,937 13,601 13,624 9,586 18,889 19,516 16,986 20,171 19,542 25,031
Russell 2000 Value Index                          
Account Value [Line Items]                          
Accumulated Value 500,000     646,850 680,033 681,189 479,285 944,431 975,786 849,324 1,008,572 977,105 1,251,574
Russell 2000 Value Index                          
Account Value [Line Items]                          
Accumulated Value 10,000     12,937 13,601 13,624 9,586 18,889 19,516 16,986 20,171 19,542 25,031
60% S&P 500 + 40% Bloomberg Gov't / Credit Bond Index                          
Account Value [Line Items]                          
Accumulated Value 10,000     11,152 12,267 12,945 12,906 17,730 19,271 17,330 20,834 21,963 24,913
Bloomberg US Government / Credit Bond Index                          
Account Value [Line Items]                          
Accumulated Value 10,000     10,054 10,193 10,649 11,695 11,796 11,342 10,796 10,984 11,496 11,939
60% S&P 500 + 40% Bloomberg Gov't / Credit Bond Index                          
Account Value [Line Items]                          
Accumulated Value 10,000     11,152 12,267 12,945 12,906 17,730 19,271 17,330 20,834 21,963 24,913
Bloomberg US Government / Credit Bond Index                          
Account Value [Line Items]                          
Accumulated Value 10,000     10,054 10,193 10,649 11,695 11,796 11,342 10,796 10,984 11,496 11,939
60% S&P 500 + 40% Bloomberg Gov't / Credit Bond Index                          
Account Value [Line Items]                          
Accumulated Value 500,000     557,610 613,338 647,267 645,300 886,500 963,537 866,508 1,041,682 1,098,162 1,245,667
Bloomberg US Government / Credit Bond Index                          
Account Value [Line Items]                          
Accumulated Value 500,000     502,700 509,637 532,469 584,757 589,786 567,080 539,803 549,196 574,788 596,975
60% S&P 500 + 40% Bloomberg Gov't / Credit Bond Index                          
Account Value [Line Items]                          
Accumulated Value 10,000     11,152 12,267 12,945 12,906 17,730 19,271 17,330 20,834 21,963 24,913
Bloomberg US Government / Credit Bond Index                          
Account Value [Line Items]                          
Accumulated Value 10,000     10,054 10,193 10,649 11,695 11,796 11,342 10,796 10,984 11,496 11,939
ICE Bank of America Merrill Lynch U.S. Convertibles Index                          
Account Value [Line Items]                          
Accumulated Value 10,000     11,771 13,022 14,043 13,549 23,593 23,071 20,570 18,340 19,490 24,371
ICE Bank of America Merrill Lynch U.S. Convertibles Index                          
Account Value [Line Items]                          
Accumulated Value 10,000     11,771 13,022 14,043 13,549 23,593 23,071 20,570 18,340 19,490 24,371
ICE Bank of America Merrill Lynch U.S. Convertibles Index                          
Account Value [Line Items]                          
Accumulated Value 100,000     117,710 130,223 140,432 135,489 235,927 230,713 205,703 183,399 183,399 229,329
ICE Bank of America Merrill Lynch U.S. Convertibles Index                          
Account Value [Line Items]                          
Accumulated Value 10,000     11,771 13,022 14,043 13,549 23,593 23,071 20,570 18,340 19,490 24,371
Russell 1000 Value Index                          
Account Value [Line Items]                          
Accumulated Value 10,000     11,922 12,751 13,474 11,160 17,420 19,453 18,303 22,013 23,594 27,338
Russell 1000 Value Index                          
Account Value [Line Items]                          
Accumulated Value 10,000     11,922 12,751 13,474 11,160 17,420 19,453 18,303 22,013 23,594 27,338
Russell 1000 Value Index                          
Account Value [Line Items]                          
Accumulated Value 500,000     596,100 637,529 673,677 558,007 870,992 972,637 915,154 1,100,656 1,179,683 1,366,899
Russell 1000 Value Index                          
Account Value [Line Items]                          
Accumulated Value 10,000     11,922 12,751 13,474 11,160 17,420 19,453 18,303 22,013 23,594 27,338
Dow Jones U.S. Micro-Cap Total Stock Market Index                          
Account Value [Line Items]                          
Accumulated Value 10,000     12,732 14,435 14,409 10,649 23,341 18,556 14,442 16,298 15,549 20,599
Dow Jones U.S. Micro-Cap Total Stock Market Index                          
Account Value [Line Items]                          
Accumulated Value 10,000     12,732 14,435 14,409 10,649 23,341 18,556 14,442 16,298 15,549 20,599
Dow Jones U.S. Micro-Cap Total Stock Market Index                          
Account Value [Line Items]                          
Accumulated Value 500,000     636,592 721,756 720,453 532,431 1,167,044 927,793 722,114 814,905 777,473 1,029,958
Dow Jones U.S. Micro-Cap Total Stock Market Index                          
Account Value [Line Items]                          
Accumulated Value $ 10,000     $ 12,732 $ 14,435 $ 14,409 $ 10,649 $ 23,341 $ 18,556 $ 14,442 $ 16,298 $ 15,549 $ 20,599