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INVESTMENTS (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2024 | Jun. 30, 2023 | Jun. 30, 2024 | Jun. 30, 2023 | Dec. 31, 2023
Equity Securities, FV-NI, Gain (Loss) [Abstract] |  |  |  |  |
Net change in unrealized appreciation (depreciation) on private investments | $ 0 | $ 24 | $ 0 | $ 24 |
Cost Method Investments | 4,400 |  | 4,400 |  |
Cost | 19,971 |  | 19,971 |  | $ 32,717
Gross Unrealized Gains |  | 320 | 693 |  |
Debt Securities, Trading, Unrealized Loss |  | (363) | (300) |  |
Investments in trading securities | 20,364 |  | 20,364 |  | 32,674
Cost | 21,421 |  | 21,421 |  | 32,982
Gross Unrealized Gains |  | 327 | 1,092 |  |
Debt Securities, Trading, and Equity Securities, Unrealized Loss |  | (394) | (324) |  |
Estimated Fair Value | 22,189 |  | 22,189 |  | 32,915
Long-term Investments | 8,747 |  | 8,747 |  | 7,247
Long-term Investments Carried at Fair Value | 1,825 |  | 1,825 |  | 241
Long-term Investments Carried at Fair Value using NAV | 300 |  | 300 |  |
Equity Method Investments | $ 4,578 | 4,180 | $ 4,578 | $ 4,180 | $ 4,284
Zarvona Energy Fund GP , L.P . |  |  |  |  |
Equity Securities, FV-NI, Gain (Loss) [Abstract] |  |  |  |  |
Equity Method Investment, Ownership Percentage | 50.00% |  | 50.00% |  | 50.00%
Equity Method Investments | $ 3,859 |  | $ 3,859 |  | $ 3,565
Zarvona Energy Fund II-A, L.P . |  |  |  |  |
Equity Securities, FV-NI, Gain (Loss) [Abstract] |  |  |  |  |
Equity Method Investment, Ownership Percentage | 0.50% |  | 0.50% |  | 0.50%
Equity Method Investments | $ 700 |  | $ 700 |  | $ 700
Salient MLP Total Return Fund, L.P. [Domain] |  |  |  |  |
Equity Securities, FV-NI, Gain (Loss) [Abstract] |  |  |  |  |
Equity Method Investment, Ownership Percentage | 0.00% |  | 0.00% |  | 0.00%
Equity Method Investments | $ 11 |  | $ 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% |  | 0.20%
Equity Method Investments | $ 8 |  | $ 8 |  | $ 8
Total |  |  |  |  |
Equity Securities, FV-NI, Gain (Loss) [Abstract] |  |  |  |  |
Equity Method Investments | 4,578 |  | 4,578 |  | 4,284
U.S. Government securities |  |  |  |  |
Equity Securities, FV-NI, Gain (Loss) [Abstract] |  |  |  |  |
Cost | 12,653 |  | 12,653 |  | 22,522
Gross Unrealized Gains |  | 14 | 233 |  |
Debt Securities, Trading, Unrealized Loss |  | (75) | (66) |  |
Investments in trading securities | 12,820 |  | 12,820 |  | 22,461
Money market funds |  |  |  |  |
Equity Securities, FV-NI, Gain (Loss) [Abstract] |  |  |  |  |
Cost | 4,293 |  | 4,293 |  | 5,367
Gross Unrealized Gains |  | 111 | 138 |  |
Debt Securities, Trading, Unrealized Loss |  | 0 | 0 |  |
Investments in trading securities | 4,431 |  | 4,431 |  | 5,478
Equity funds |  |  |  |  |
Equity Securities, FV-NI, Gain (Loss) [Abstract] |  |  |  |  |
Cost | 1,507 |  | 1,507 |  | 4,295
Gross Unrealized Gains |  | 195 | 265 |  |
Debt Securities, Trading, Unrealized Loss |  | (260) | (123) |  |
Investments in trading securities | 1,649 |  | 1,649 |  | 4,230
Equity Securities |  |  |  |  |
Equity Securities, FV-NI, Gain (Loss) [Abstract] |  |  |  |  |
Cost | 169 |  | 169 |  | 381
Gross Unrealized Gains |  | 0 | 57 |  |
Debt Securities, Trading, Unrealized Loss |  | (24) | (108) |  |
Investments in trading securities | 118 |  | 118 |  | 357
us-gaap_EquitySecuritiesMember [Member] |  |  |  |  |
Equity Securities, FV-NI, Gain (Loss) [Abstract] |  |  |  |  |
Cost | 149 |  | 149 |  | 152
Gross Unrealized Gains |  | 0 | 0 |  |
Debt Securities, Trading, Unrealized Loss |  | (4) | (3) |  |
Investments in trading securities | 146 |  | 146 |  | 148
Private investment funds |  |  |  |  |
Equity Securities, FV-NI, Gain (Loss) [Abstract] |  |  |  |  |
Cost | 1,450 |  | 1,450 |  | 265
Gross Unrealized Gains |  | 7 | 399 |  |
Equity Securities, FV-NI, Unrealized Loss |  | $ (31) | (24) |  |
Estimated Fair Value | 1,825 |  | 1,825 |  | $ 241
Exchange Traded Funds |  |  |  |  |
Equity Securities, FV-NI, Gain (Loss) [Abstract] |  |  |  |  |
Cost | 1,200 |  | 1,200 |  |
Gross Unrealized Gains |  |  | 0 |  |
Debt Securities, Trading, Unrealized Loss |  |  | 0 |  |
Investments in trading securities | $ 1,200 |  | $ 1,200 |  |

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