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Investments (Trading Securities FV) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Investment balances
Cost	$ 32,717	$ 16,121
Gross Unrealized Gains	320	143
Gross Unrealized Losses	(363)	(922)
Investments in trading securities	32,674	15,342
Trading Securities, Unrealized Holding Gain	320	143
Trading Securities, Unrealized Holding Loss	363	922
Trading Securities, Cost	32,717	16,121
Investment Owned, at Cost	32,982	19,861
Investments in trading securities	32,674	15,342
Unrealized Gain on Securities	327	143
Unrealized Loss on Securities	(394)	(1,635)
Investment Owned, at Fair Value	32,915	18,369
Unrealized Gain (Loss) on Investments	6	(1,495)	$ (1,797)
U.S. Government securities
Investment balances
Cost	22,522	5,728
Gross Unrealized Gains	14	0
Gross Unrealized Losses	(75)	(389)
Investments in trading securities	22,461	5,339
Trading Securities, Unrealized Holding Gain	14	0
Trading Securities, Unrealized Holding Loss	75	389
Trading Securities, Cost	22,522	5,728
Investments in trading securities	22,461	5,339
Money market funds
Investment balances
Cost	5,367	4,093
Gross Unrealized Gains	111	111
Gross Unrealized Losses	0	0
Investments in trading securities	5,478	4,204
Trading Securities, Unrealized Holding Gain	111	111
Trading Securities, Unrealized Holding Loss	0	0
Trading Securities, Cost	5,367	4,093
Investments in trading securities	5,478	4,204
Equity funds
Investment balances
Cost	4,295	4,863
Gross Unrealized Gains	195	32
Gross Unrealized Losses	(260)	(446)
Investments in trading securities	4,230	4,449
Trading Securities, Unrealized Holding Gain	195	32
Trading Securities, Unrealized Holding Loss	260	446
Trading Securities, Cost	4,295	4,863
Investments in trading securities	4,230	4,449
Private investment fund
Investment balances
Investment Owned, at Cost	265	265
Unrealized Gain on Securities	7	0
Unrealized Loss on Securities	(31)	(30)
Investment Owned, at Fair Value	241	235
Private equity
Investment balances
Gross Unrealized Losses		(683)
Trading Securities, Unrealized Holding Loss		683
Investment Owned, at Cost		3,475
Unrealized Gain on Securities		0
Investment Owned, at Fair Value		2,792
Equity Securities
Investment balances
Cost		1,278
Gross Unrealized Gains		0
Gross Unrealized Losses		(65)
Investments in trading securities		1,213
Trading Securities, Unrealized Holding Gain		0
Trading Securities, Unrealized Holding Loss		65
Trading Securities, Cost		1,278
Investments in trading securities		1,213
Debt Securities, Trading, Amortized Cost	381
Debt Securities, Trading, Unrealized Gain	0
Debt Securities, Trading, Unrealized Loss	(24)
Debt Securities, Trading	357
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Investment balances
Debt Securities, Trading, Amortized Cost	152	159
Debt Securities, Trading, Unrealized Gain	0	0
Debt Securities, Trading, Unrealized Loss	(4)	(22)
Debt Securities, Trading	$ 148	$ 137

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