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INVESTMENTS (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2024 | Jun. 30, 2025 | Dec. 31, 2024
Equity Securities, FV-NI, Gain (Loss) [Abstract] |  |  |
Cost |  | $ 17,273 | $ 25,232
Gross Unrealized Gains | $ 824 | 866 |
Debt Securities, Trading, Unrealized Loss | (308) | (317) |
Investments in trading securities |  | 17,822 | 25,748
Cost |  | 18,316 | 26,788
Gross Unrealized Gains | 1,226 | 1,796 |
Debt Securities, Trading, and Equity Securities, Unrealized Loss | (320) | (344) |
Estimated Fair Value |  | 19,768 | 27,694
Equity Method Investments | 4,578 | 4,197 | 4,250
Investment Owned, at Fair Value |  | 19,768 | 27,694
Investments under fair value measurement alternative |  | 11,747 | 10,747
Total investments |  | 35,712 | 42,691
InvestCloud private investment |  | 4,455 | 4,455
Investment carrying value - Vista |  | 2,792 | 2,792
WEBs - preferred stock |  | 1,799 | 1,799
WEBs - call option |  | 201 | 201
TXSE - private investment |  | 1,500 | 1,500
Investment carrying value - Ridgeline |  | 1,000 |
Total investments under measurement alternative |  | $ 11,747 | $ 10,747
Zarvona Energy Fund GP , L.P . |  |  |
Equity Securities, FV-NI, Gain (Loss) [Abstract] |  |  |
Equity Method Investment, Ownership Percentage |  | 50.00% | 50.00%
Equity Method Investments |  | $ 3,447 | $ 3,524
Zarvona Energy Fund II-A, L.P . |  |  |
Equity Securities, FV-NI, Gain (Loss) [Abstract] |  |  |
Equity Method Investment, Ownership Percentage |  | 0.50% | 0.50%
Equity Method Investments |  | $ 731 | $ 707
Salient MLP Total Return Fund, L.P. [Domain] |  |  |
Equity Securities, FV-NI, Gain (Loss) [Abstract] |  |  |
Equity Method Investment, Ownership Percentage |  | 0.00% | 0.00%
Equity Method Investments |  | $ 11 | $ 11
Salient MLP Total Return TE Fund, L.P. |  |  |
Equity Securities, FV-NI, Gain (Loss) [Abstract] |  |  |
Equity Method Investment, Ownership Percentage |  | 0.20% | 0.20%
Equity Method Investments |  | $ 8 | $ 8
Total |  |  |
Equity Securities, FV-NI, Gain (Loss) [Abstract] |  |  |
Equity Method Investments |  | 4,197 | 4,250
U.S. Government securities |  |  |
Equity Securities, FV-NI, Gain (Loss) [Abstract] |  |  |
Cost |  | 8,245 | 15,859
Gross Unrealized Gains | 263 | 266 |
Debt Securities, Trading, Unrealized Loss | (66) | (80) |
Investments in trading securities |  | 8,431 | 16,056
Money market funds |  |  |
Equity Securities, FV-NI, Gain (Loss) [Abstract] |  |  |
Cost |  | 7,650 | 7,629
Gross Unrealized Gains | 174 | 174 |
Debt Securities, Trading, Unrealized Loss | 0 | 0 |
Investments in trading securities |  | 7,824 | 7,803
Equity funds |  |  |
Equity Securities, FV-NI, Gain (Loss) [Abstract] |  |  |
Cost |  | 936 | 1,432
Gross Unrealized Gains | 318 | 338 |
Debt Securities, Trading, Unrealized Loss | (132) | (129) |
Investments in trading securities |  | 1,145 | 1,618
Equity Securities |  |  |
Equity Securities, FV-NI, Gain (Loss) [Abstract] |  |  |
Cost |  | 301 | 183
Gross Unrealized Gains | 69 | 88 |
Debt Securities, Trading, Unrealized Loss | (108) | (108) |
Investments in trading securities |  | 281 | 144
us-gaap_EquitySecuritiesMember [Member] |  |  |
Equity Securities, FV-NI, Gain (Loss) [Abstract] |  |  |
Cost |  | 141 | 129
Gross Unrealized Gains | 0 | 0 |
Debt Securities, Trading, Unrealized Loss | (2) | 0 |
Investments in trading securities |  | 141 | 127
Private investment funds |  |  |
Equity Securities, FV-NI, Gain (Loss) [Abstract] |  |  |
Cost |  | 1,043 | 1,556
Gross Unrealized Gains | 402 | 930 |
Equity Securities, FV-NI, Unrealized Loss | $ (12) | (27) |
Estimated Fair Value |  | $ 1,946 | $ 1,946

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