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INVESTMENTS (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2023
Jun. 30, 2022
Jun. 30, 2023
Jun. 30, 2022
Dec. 31, 2022
Equity Securities, FV-NI, Gain (Loss) [Abstract]          
Net change in unrealized appreciation (depreciation) on private investments $ 24 $ (299) $ 24 $ (262)  
Cost Method Investments 4,400   4,400    
Cost 23,259   23,259   $ 16,121
Gross Unrealized Gains   143 192    
Debt Securities, Trading, Unrealized Loss   (922) (557)    
Investments in trading securities 22,894   22,894   15,342
Cost 23,524   23,524   19,861
Gross Unrealized Gains   143 199    
Debt Securities, Trading, and Equity Securities, Unrealized Loss   (1,635) (570)    
Estimated Fair Value 23,153   23,153   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 $ 4,180   $ 4,180   $ 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 $ 3,461   $ 3,461   $ 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 4,180   4,180   6,574
U.S. Government and Government agency obligations          
Equity Securities, FV-NI, Gain (Loss) [Abstract]          
Cost 14,776   14,776   5,728
Gross Unrealized Gains   0 0    
Debt Securities, Trading, Unrealized Loss   (389) (256)    
Investments in trading securities 14,520   14,520   5,339
Money market funds          
Equity Securities, FV-NI, Gain (Loss) [Abstract]          
Cost 4,194   4,194   4,093
Gross Unrealized Gains   111 111    
Debt Securities, Trading, Unrealized Loss   0 0    
Investments in trading securities 4,305   4,305   4,204
Equity funds          
Equity Securities, FV-NI, Gain (Loss) [Abstract]          
Cost 3,639   3,639   4,863
Gross Unrealized Gains   32 81    
Debt Securities, Trading, Unrealized Loss   (446) (274)    
Investments in trading securities 3,446   3,446   4,449
Equity Securities          
Equity Securities, FV-NI, Gain (Loss) [Abstract]          
Cost 490   490   1,278
Gross Unrealized Gains   0 0    
Debt Securities, Trading, Unrealized Loss   (65) (13)    
Investments in trading securities 477   477   1,213
us-gaap_EquitySecuritiesMember [Member]          
Equity Securities, FV-NI, Gain (Loss) [Abstract]          
Cost 160   160   159
Gross Unrealized Gains   0 0    
Debt Securities, Trading, Unrealized Loss   (22) (14)    
Investments in trading securities 146   146   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