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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