Regulatory Requirements	12 Months Ended
Dec. 31, 2019
Regulatory Requirements [Abstract]
Regulatory Requirements	13. Regulatory Requirements The Company’s broker-dealer subsidiary, G.distributors, is subject to certain net capital requirements. G.distributors computes its net capital under the alternative method permitted, which requires minimum net capital of the greater of $250,000 or 2% of the aggregate debit items in the reserve formula for those broker-dealers subject to Rule 15c3-3 promulgated under the Securities Exchange Act of 1934, as amended. The requirement was $250,000 for the broker-dealer at December 31, 2019 and 2018. At December 31, 2019 and 2018, G.distributors had net capital, as defined, of approximately $4.3 million and $3.7 million, respectively, exceeding the regulatory requirement by approximately $4.1 million and $3.4 million, respectively. Net capital requirements for the Company’s affiliated broker-dealer may increase in accordance with the rules and regulations applicable to broker-dealers to the extent G.distributors engages in other business activities. The Company’s subsidiary, GAMCO Asset Management (UK) Limited is authorized and regulated by the Financial Conduct Authority (“FCA”). In February 2011, GAMCO Asset Management (UK) Limited increased its permitted license with the FCA’s predecessor, the Financial Services Authority. At December 31, 2019 and 2018, GAMCO Asset Management (UK) Limited held total capital of £668 thousand and £671 thousand ($876 thousand and $852 thousand), respectively, and had a Financial Resources Requirement of £194 thousand and £154 thousand ($254 thousand and $195 thousand), respectively. These minimum requirements have consistently been met or exceeded.

13. Regulatory Requirements

The Company’s broker-dealer subsidiary, G.distributors, is subject to certain net capital requirements. G.distributors computes its net capital under the alternative method permitted, which requires minimum net capital of the greater of $250,000 or 2% of the aggregate debit items in the reserve formula for those broker-dealers subject to Rule 15c3-3 promulgated under the Securities Exchange Act of 1934, as amended. The requirement was $250,000 for the broker-dealer at December 31, 2019 and 2018. At December 31, 2019 and 2018, G.distributors had net capital, as defined, of approximately $4.3 million and $3.7 million, respectively, exceeding the regulatory requirement by approximately $4.1 million and $3.4 million, respectively. Net capital requirements for the Company’s affiliated broker-dealer may increase in accordance with the rules and regulations applicable to broker-dealers to the extent G.distributors engages in other business activities.

The Company’s subsidiary, GAMCO Asset Management (UK) Limited is authorized and regulated by the Financial Conduct Authority (“FCA”). In February 2011, GAMCO Asset Management (UK) Limited increased its permitted license with the FCA’s predecessor, the Financial Services Authority. At December 31, 2019 and 2018, GAMCO Asset Management (UK) Limited held total capital of £668 thousand and £671 thousand ($876 thousand and $852 thousand), respectively, and had a Financial Resources Requirement of £194 thousand and £154 thousand ($254 thousand and $195 thousand), respectively. These minimum requirements have consistently been met or exceeded.