Investments - Investments, Fair Value (Details) - USD ($)	6 Months Ended	12 Months Ended
	Jun. 30, 2022	Dec. 31, 2021
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Equity Investments, at Fair Value, Cost	$ 54,432,000	$ 87,808,000
Equity Investments, at Fair Value, Unrealized Gain/(Loss)	(7,647,000)	2,411,000
Equity Investments, at Fair Value	46,785,000	90,219,000
Trading Securities, at Fair Value, Cost	20,954,000
Trading Securities, at Fair Value, Unrealized Gain/(Loss)	(312,000)
Trading Securities, at Fair Value	20,642,000	0
Securities Short Sold Proceeds	311,000	259,000
Securities Short Sold Unrealized (Gain)/Loss	(70,000)	(22,000)
Securities Short Sold,Fair Value	241,000	237,000
Equity Securities
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Equity Investments, at Fair Value, Cost	54,432,000	80,480,000
Equity Investments, at Fair Value, Unrealized Gain/(Loss)	(7,647,000)	2,420,000
Equity Investments, at Fair Value	46,785,000	82,900,000
Securities Short Sold Proceeds	311,000	259,000
Securities Short Sold Unrealized (Gain)/Loss	(70,000)	(22,000)
Securities Short Sold,Fair Value	241,000	237,000
Mutual Funds
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Equity Investments, at Fair Value, Cost	0	7,328,000
Equity Investments, at Fair Value, Unrealized Gain/(Loss)	0	(9,000)
Equity Investments, at Fair Value	0	7,319,000
Leveraged Loans
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Trading Securities, at Fair Value, Cost	19,944,000
Trading Securities, at Fair Value, Unrealized Gain/(Loss)	(309,000)
Trading Securities, at Fair Value	19,635,000	0
Corporate Bonds
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Trading Securities, at Fair Value, Cost	1,010,000
Trading Securities, at Fair Value, Unrealized Gain/(Loss)	(3,000)
Trading Securities, at Fair Value	$ 1,007,000	$ 0