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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% |

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