Shareholder Fees	Jan. 28, 2026 USD ($)
TETON WESTWOOD MIGHTY MITES FUND \| TETON WESTWOOD MIGHTY MITES FUND CLASS AAA
Prospectus [Line Items]
Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price)	0.00%
Maximum Deferred Sales Charge (as a percentage of Offering Price)	0.00%
Maximum Sales Charge on Reinvested Dividends and Distributions (as a percentage)	0.00%
Exchange Fee (as a percentage of Amount Redeemed)	2.00%
Exchange Fee	$ 0
TETON WESTWOOD MIGHTY MITES FUND \| TETON WESTWOOD MIGHTY MITES FUND CLASS A
Prospectus [Line Items]
Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price)	4.00%
Maximum Deferred Sales Charge (as a percentage of Offering Price)	0.00%
Maximum Sales Charge on Reinvested Dividends and Distributions (as a percentage)	0.00%
Exchange Fee (as a percentage of Amount Redeemed)	2.00%
Exchange Fee	$ 0
TETON WESTWOOD MIGHTY MITES FUND \| TETON WESTWOOD MIGHTY MITES FUND CLASS C
Prospectus [Line Items]
Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price)	0.00%
Maximum Deferred Sales Charge (as a percentage of Offering Price)	1.00%
Maximum Sales Charge on Reinvested Dividends and Distributions (as a percentage)	0.00%
Exchange Fee (as a percentage of Amount Redeemed)	2.00%
Exchange Fee	$ 0
TETON WESTWOOD MIGHTY MITES FUND \| TETON WESTWOOD MIGHTY MITES FUND Class I
Prospectus [Line Items]
Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price)	0.00%
Maximum Deferred Sales Charge (as a percentage of Offering Price)	0.00%
Maximum Sales Charge on Reinvested Dividends and Distributions (as a percentage)	0.00%
Exchange Fee (as a percentage of Amount Redeemed)	2.00%
Exchange Fee	$ 0
Keeley Small Cap Fund \| Keeley Small Cap Fund CLASS AAA
Prospectus [Line Items]
Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price)	0.00%
Maximum Deferred Sales Charge (as a percentage of Offering Price)	0.00%
Maximum Sales Charge on Reinvested Dividends and Distributions (as a percentage)	0.00%
Exchange Fee (as a percentage of Amount Redeemed)	2.00%
Exchange Fee	$ 0
Keeley Small Cap Fund \| Keeley Small Cap Fund CLASS A
Prospectus [Line Items]
Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price)	4.00%
Maximum Deferred Sales Charge (as a percentage of Offering Price)	0.00%
Maximum Sales Charge on Reinvested Dividends and Distributions (as a percentage)	0.00%
Exchange Fee (as a percentage of Amount Redeemed)	2.00%
Exchange Fee	$ 0
Keeley Small Cap Fund \| Keeley Small Cap Fund CLASS C
Prospectus [Line Items]
Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price)	0.00%
Maximum Deferred Sales Charge (as a percentage of Offering Price)	1.00%
Maximum Sales Charge on Reinvested Dividends and Distributions (as a percentage)	0.00%
Exchange Fee (as a percentage of Amount Redeemed)	2.00%
Exchange Fee	$ 0
Keeley Small Cap Fund \| Keeley Small Cap Fund Class I
Prospectus [Line Items]
Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price)	0.00%
Maximum Deferred Sales Charge (as a percentage of Offering Price)	0.00%
Maximum Sales Charge on Reinvested Dividends and Distributions (as a percentage)	0.00%
Exchange Fee (as a percentage of Amount Redeemed)	2.00%
Exchange Fee	$ 0
TETON Convertible Securities Fund \| TETON Convertible Securities Fund CLASS AAA
Prospectus [Line Items]
Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price)	0.00%
Maximum Deferred Sales Charge (as a percentage of Offering Price)	0.00%
Maximum Sales Charge on Reinvested Dividends and Distributions (as a percentage)	0.00%
Exchange Fee (as a percentage of Amount Redeemed)	2.00%
Exchange Fee	$ 0
TETON Convertible Securities Fund \| TETON Convertible Securities Fund CLASS A
Prospectus [Line Items]
Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price)	4.00%
Maximum Deferred Sales Charge (as a percentage of Offering Price)	0.00%
Maximum Sales Charge on Reinvested Dividends and Distributions (as a percentage)	0.00%
Exchange Fee (as a percentage of Amount Redeemed)	2.00%
Exchange Fee	$ 0
TETON Convertible Securities Fund \| TETON Convertible Securities Fund CLASS C
Prospectus [Line Items]
Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price)	0.00%
Maximum Deferred Sales Charge (as a percentage of Offering Price)	1.00%
Maximum Sales Charge on Reinvested Dividends and Distributions (as a percentage)	0.00%
Exchange Fee (as a percentage of Amount Redeemed)	2.00%
Exchange Fee	$ 0
TETON Convertible Securities Fund \| TETON Convertible Securities Fund Class I
Prospectus [Line Items]
Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price)	0.00%
Maximum Deferred Sales Charge (as a percentage of Offering Price)	0.00%
Maximum Sales Charge on Reinvested Dividends and Distributions (as a percentage)	0.00%
Exchange Fee (as a percentage of Amount Redeemed)	2.00%
Exchange Fee	$ 0
TETON WESTWOOD EQUITY FUND \| TETON WESTWOOD EQUITY FUND CLASS AAA
Prospectus [Line Items]
Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price)	0.00%
Maximum Deferred Sales Charge (as a percentage of Offering Price)	0.00%
Maximum Sales Charge on Reinvested Dividends and Distributions (as a percentage)	0.00%
Exchange Fee (as a percentage of Amount Redeemed)	0.00%
Exchange Fee	$ 0
TETON WESTWOOD EQUITY FUND \| TETON WESTWOOD EQUITY FUND CLASS A
Prospectus [Line Items]
Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price)	4.00%
Maximum Deferred Sales Charge (as a percentage of Offering Price)	0.00%
Maximum Sales Charge on Reinvested Dividends and Distributions (as a percentage)	0.00%
Exchange Fee (as a percentage of Amount Redeemed)	0.00%
Exchange Fee	$ 0
TETON WESTWOOD EQUITY FUND \| TETON WESTWOOD EQUITY FUND CLASS C
Prospectus [Line Items]
Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price)	0.00%
Maximum Deferred Sales Charge (as a percentage of Offering Price)	1.00%
Maximum Sales Charge on Reinvested Dividends and Distributions (as a percentage)	0.00%
Exchange Fee (as a percentage of Amount Redeemed)	0.00%
Exchange Fee	$ 0
TETON WESTWOOD EQUITY FUND \| TETON WESTWOOD EQUITY FUND Class I
Prospectus [Line Items]
Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price)	0.00%
Maximum Deferred Sales Charge (as a percentage of Offering Price)	0.00%
Maximum Sales Charge on Reinvested Dividends and Distributions (as a percentage)	0.00%
Exchange Fee (as a percentage of Amount Redeemed)	0.00%
Exchange Fee	$ 0
TETON WESTWOOD BALANCED FUND \| TETON WESTWOOD BALANCED FUND CLASS AAA
Prospectus [Line Items]
Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price)	0.00%
Maximum Deferred Sales Charge (as a percentage of Offering Price)	0.00%
TETON WESTWOOD BALANCED FUND \| TETON WESTWOOD BALANCED FUND CLASS A
Prospectus [Line Items]
Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price)	4.00%
Maximum Deferred Sales Charge (as a percentage of Offering Price)	0.00%
TETON WESTWOOD BALANCED FUND \| TETON WESTWOOD BALANCED FUND CLASS C
Prospectus [Line Items]
Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price)	0.00%
Maximum Deferred Sales Charge (as a percentage of Offering Price)	1.00%
TETON WESTWOOD BALANCED FUND \| TETON WESTWOOD BALANCED FUND Class I
Prospectus [Line Items]
Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price)	0.00%
Maximum Deferred Sales Charge (as a percentage of Offering Price)	0.00%

Shareholder Fees

Jan. 28, 2026

USD ($)

TETON WESTWOOD MIGHTY MITES FUND | TETON WESTWOOD MIGHTY MITES FUND CLASS AAA

Prospectus [Line Items]

Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price)

0.00%

Maximum Deferred Sales Charge (as a percentage of Offering Price)

0.00%

Maximum Sales Charge on Reinvested Dividends and Distributions (as a percentage)

0.00%

Exchange Fee (as a percentage of Amount Redeemed)