Investments (Details) - USD ($) $ in Thousands	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Investments, Debt and Equity Securities [Abstract]
Investment Owned, at Cost	$ 26,788	$ 32,982
Schedule Of Investments [Line Items]
Trading Securities, Cost	25,232	32,717
Equity Method Investments	4,250	4,284	$ 6,574
Total investments	42,691	44,446
Investment Owned, at Fair Value	27,694	32,915
Investments under fair value measurement alternative	10,747	7,247
InvestCloud private investment	4,455	4,455
Investment carrying value - Vista	2,792	2,792
WEBs - preferred stock	1,799
WEBs - call option	201
TXSE - private investment	1,500
Total investments under measurement alternative	10,747	7,247
Zarvona Energy Fund II-A, L.P. [Domain]
Schedule Of Investments [Line Items]
Equity Method Investments	$ 707	$ 700
Equity Method Investment, Ownership Percentage	0.50%	0.50%
Salient MLP Total Return Fund, L.P. [Domain]
Schedule Of Investments [Line Items]
Equity Method Investments	$ 11	$ 11
Equity Method Investment, Ownership Percentage	0.00%	0.00%
Salient MLP Total Return TE Fund, L.P. [Domain]
Schedule Of Investments [Line Items]
Equity Method Investments	$ 8	$ 8
Equity Method Investment, Ownership Percentage	0.20%	0.20%
Total [Domain]
Schedule Of Investments [Line Items]
Equity Method Investments	$ 4,250	$ 4,284
Zarvona Energy Fund GP, L.P. [Domain]
Schedule Of Investments [Line Items]
Equity Method Investments	$ 3,524	$ 3,565
Equity Method Investment, Ownership Percentage	50.00%	50.00%