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INVESTMENTS (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2023 | Sep. 30, 2022 | Sep. 30, 2023 | Sep. 30, 2022 | Dec. 31, 2022
Equity Securities, FV-NI, Gain (Loss) [Abstract] |  |  |  |  |
Net change in unrealized appreciation (depreciation) on private investments | $ 0 | $ (249) | $ 24 | $ (511) |
Cost Method Investments | 4,400 |  | 4,400 |  |
Cost | 31,803 |  | 31,803 |  | $ 16,121
Gross Unrealized Gains |  | 143 | 194 |  |
Debt Securities, Trading, Unrealized Loss |  | (922) | (685) |  |
Investments in trading securities | 31,312 |  | 31,312 |  | 15,342
Cost | 32,068 |  | 32,068 |  | 19,861
Gross Unrealized Gains |  | 143 | 201 |  |
Debt Securities, Trading, and Equity Securities, Unrealized Loss |  | (1,635) | (698) |  |
Estimated Fair Value | 31,571 |  | 31,571 |  | 18,369
Long-term Investments | 7,247 |  | 7,247 |  | $ 4,455
Equity Method Investment, Ownership Percentage |  |  |  |  | 47.50%
Long-term Investments Carried at Fair Value | 259 |  | 259 |  | $ 3,027
Long-term Investments Carried at Fair Value using NAV | 300 |  | 300 |  |
Equity Method Investments | $ 4,256 |  | $ 4,256 |  | $ 6,574
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 | $ 3,537 |  | $ 3,537 |  | $ 3,438
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
Broadmark Asset Management LLC |  |  |  |  |
Equity Securities, FV-NI, Gain (Loss) [Abstract] |  |  |  |  |
Equity Method Investment, Ownership Percentage | 0.00% |  | 0.00% |  | 47.50%
Equity Method Investments | $ 0 |  | $ 0 |  | $ 2,417
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 | 4,256 |  | 4,256 |  | 6,574
U.S. Government and Government agency obligations |  |  |  |  |
Equity Securities, FV-NI, Gain (Loss) [Abstract] |  |  |  |  |
Cost | 23,429 |  | 23,429 |  | 5,728
Gross Unrealized Gains |  | 0 | 0 |  |
Debt Securities, Trading, Unrealized Loss |  | (389) | (254) |  |
Investments in trading securities | 23,175 |  | 23,175 |  | 5,339
Money market funds |  |  |  |  |
Equity Securities, FV-NI, Gain (Loss) [Abstract] |  |  |  |  |
Cost | 4,259 |  | 4,259 |  | 4,093
Gross Unrealized Gains |  | 111 | 111 |  |
Debt Securities, Trading, Unrealized Loss |  | 0 | 0 |  |
Investments in trading securities | 4,370 |  | 4,370 |  | 4,204
Equity funds |  |  |  |  |
Equity Securities, FV-NI, Gain (Loss) [Abstract] |  |  |  |  |
Cost | 3,580 |  | 3,580 |  | 4,863
Gross Unrealized Gains |  | 32 | 83 |  |
Debt Securities, Trading, Unrealized Loss |  | (446) | (371) |  |
Investments in trading securities | 3,292 |  | 3,292 |  | 4,449
Equity Securities |  |  |  |  |
Equity Securities, FV-NI, Gain (Loss) [Abstract] |  |  |  |  |
Cost | 371 |  | 371 |  | 1,278
Gross Unrealized Gains |  | 0 | 0 |  |
Debt Securities, Trading, Unrealized Loss |  | (65) | (43) |  |
Investments in trading securities | 328 |  | 328 |  | 1,213
us-gaap_EquitySecuritiesMember [Member] |  |  |  |  |
Equity Securities, FV-NI, Gain (Loss) [Abstract] |  |  |  |  |
Cost | 164 |  | 164 |  | 159
Gross Unrealized Gains |  | 0 | 0 |  |
Debt Securities, Trading, Unrealized Loss |  | (22) | (17) |  |
Investments in trading securities | 147 |  | 147 |  | 137
Private investment fund |  |  |  |  |
Equity Securities, FV-NI, Gain (Loss) [Abstract] |  |  |  |  |
Cost | 265 |  | 265 |  | 265
Gross Unrealized Gains |  | 0 | 7 |  |
Equity Securities, FV-NI, Unrealized Loss |  | (30) | (13) |  |
Estimated Fair Value | $ 259 |  | $ 259 |  | 235
Private equity |  |  |  |  |
Equity Securities, FV-NI, Gain (Loss) [Abstract] |  |  |  |  |
Cost |  |  |  |  | 3,475
Gross Unrealized Gains |  | 0 |  |  |
Equity Securities, FV-NI, Unrealized Loss |  | $ (683) |  |  |
Estimated Fair Value |  |  |  |  | $ 2,792

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