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INVESTMENTS (Details) - USD ($) $ in Thousands | 3 Months Ended |
--- | --- | ---
Mar. 31, 2024 | Mar. 31, 2023 | Dec. 31, 2023
Equity Securities, FV-NI, Gain (Loss) [Abstract] |  |  |
Cost Method Investments | $ 4,400 |  |
Cost | 20,140 |  | $ 32,717
Gross Unrealized Gains | 707 | $ 320 |
Debt Securities, Trading, Unrealized Loss | (180) | (363) |
Investments in trading securities | 20,667 |  | 32,674
Cost | 20,405 |  | 32,982
Gross Unrealized Gains | 707 | 327 |
Debt Securities, Trading, and Equity Securities, Unrealized Loss | (204) | (394) |
Estimated Fair Value | 20,908 |  | 32,915
Long-term Investments | 7,247 |  | 7,247
Long-term Investments Carried at Fair Value | 241 |  | 241
Long-term Investments Carried at Fair Value using NAV | 300 |  |
Equity Method Investments | $ 4,519 | 4,228 | $ 4,284
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 | $ 3,800 |  | $ 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%
Equity Method Investments | $ 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%
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 | 4,519 |  | 4,284
U.S. Government securities |  |  |
Equity Securities, FV-NI, Gain (Loss) [Abstract] |  |  |
Cost | 12,542 |  | 22,522
Gross Unrealized Gains | 235 | 14 |
Debt Securities, Trading, Unrealized Loss | (47) | (75) |
Investments in trading securities | 12,730 |  | 22,461
Money market funds |  |  |
Equity Securities, FV-NI, Gain (Loss) [Abstract] |  |  |
Cost | 4,178 |  | 5,367
Gross Unrealized Gains | 145 | 111 |
Debt Securities, Trading, Unrealized Loss | 0 | 0 |
Investments in trading securities | 4,323 |  | 5,478
Equity funds |  |  |
Equity Securities, FV-NI, Gain (Loss) [Abstract] |  |  |
Cost | 3,008 |  | 4,295
Gross Unrealized Gains | 327 | 195 |
Debt Securities, Trading, Unrealized Loss | (104) | (260) |
Investments in trading securities | 3,231 |  | 4,230
Equity Securities |  |  |
Equity Securities, FV-NI, Gain (Loss) [Abstract] |  |  |
Cost | 263 |  | 381
Gross Unrealized Gains | 0 | 0 |
Debt Securities, Trading, Unrealized Loss | (26) | (24) |
Investments in trading securities | 237 |  | 357
us-gaap_EquitySecuritiesMember [Member] |  |  |
Equity Securities, FV-NI, Gain (Loss) [Abstract] |  |  |
Cost | 149 |  | 152
Gross Unrealized Gains | 0 | 0 |
Debt Securities, Trading, Unrealized Loss | (3) | (4) |
Investments in trading securities | 146 |  | 148
Private investment fund |  |  |
Equity Securities, FV-NI, Gain (Loss) [Abstract] |  |  |
Cost | 265 |  | 265
Gross Unrealized Gains | 0 | 7 |
Equity Securities, FV-NI, Unrealized Loss | (24) | $ (31) |
Estimated Fair Value | $ 241 |  | $ 241

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