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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