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INVESTMENTS (Details) - USD ($) $ in Thousands | 3 Months Ended |
--- | --- | ---
Mar. 31, 2023 | Mar. 31, 2022 | Dec. 31, 2022
Equity Securities, FV-NI, Gain (Loss) [Abstract] |  |  |
Net change in unrealized appreciation (depreciation) on private investments | $ 0 | $ 37 |
Cost Method Investments | 4,400 |  |
Cost | 16,088 |  | $ 16,121
Gross Unrealized Gains | 206 | 143 |
Debt Securities, Trading, Unrealized Loss | (700) | (922) |
Investments in trading securities | 15,594 |  | 15,342
Cost | 19,828 |  | 19,861
Gross Unrealized Gains | 206 | 143 |
Debt Securities, Trading, and Equity Securities, Unrealized Loss | (1,396) | (1,635) |
Estimated Fair Value | 18,638 |  | 18,369
Long-term Investments | 4,455 |  | $ 4,455
Equity Method Investment, Ownership Percentage |  |  | 47.50%
Long-term Investments Carried at Fair Value | 3,044 |  | $ 3,027
Long-term Investments Carried at Fair Value using NAV | 300 |  |
Equity Method Investments | $ 4,228 |  | $ 6,574
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 | $ 3,509 |  | $ 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%
Equity Method Investments | $ 700 |  | $ 700
Broadmark Asset Management LLC |  |  |
Equity Securities, FV-NI, Gain (Loss) [Abstract] |  |  |
Equity Method Investment, Ownership Percentage | 0.00% |  | 47.50%
Equity Method Investments | $ 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%
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 | 4,228 |  | 6,574
U.S. Government and Government agency obligations |  |  |
Equity Securities, FV-NI, Gain (Loss) [Abstract] |  |  |
Cost | 7,727 |  | 5,728
Gross Unrealized Gains | 0 | 0 |
Debt Securities, Trading, Unrealized Loss | (316) | (389) |
Investments in trading securities | 7,411 |  | 5,339
Money market funds |  |  |
Equity Securities, FV-NI, Gain (Loss) [Abstract] |  |  |
Cost | 4,087 |  | 4,093
Gross Unrealized Gains | 153 | 111 |
Debt Securities, Trading, Unrealized Loss | 0 | 0 |
Investments in trading securities | 4,240 |  | 4,204
Equity funds |  |  |
Equity Securities, FV-NI, Gain (Loss) [Abstract] |  |  |
Cost | 3,629 |  | 4,863
Gross Unrealized Gains | 53 | 32 |
Debt Securities, Trading, Unrealized Loss | (329) | (446) |
Investments in trading securities | 3,353 |  | 4,449
Equity Securities |  |  |
Equity Securities, FV-NI, Gain (Loss) [Abstract] |  |  |
Cost | 483 |  | 1,278
Gross Unrealized Gains | 0 | 0 |
Debt Securities, Trading, Unrealized Loss | (41) | (65) |
Investments in trading securities | 442 |  | 1,213
us-gaap_EquitySecuritiesMember [Member] |  |  |
Equity Securities, FV-NI, Gain (Loss) [Abstract] |  |  |
Cost | 162 |  | 159
Gross Unrealized Gains | 0 | 0 |
Debt Securities, Trading, Unrealized Loss | (14) | (22) |
Investments in trading securities | 148 |  | 137
Private investment fund |  |  |
Equity Securities, FV-NI, Gain (Loss) [Abstract] |  |  |
Cost | 265 |  | 265
Gross Unrealized Gains | 0 | 0 |
Equity Securities, FV-NI, Unrealized Loss | (13) | (30) |
Estimated Fair Value | 252 |  | 235
Private equity |  |  |
Equity Securities, FV-NI, Gain (Loss) [Abstract] |  |  |
Cost | 3,475 |  | 3,475
Gross Unrealized Gains | 0 | 0 |
Equity Securities, FV-NI, Unrealized Loss | (683) | $ (683) |
Estimated Fair Value | $ 2,792 |  | $ 2,792

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