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INVESTMENTS (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2024
Sep. 30, 2023
Sep. 30, 2024
Sep. 30, 2023
Dec. 31, 2023
Equity Securities, FV-NI, Gain (Loss) [Abstract]          
Net change in unrealized appreciation (depreciation) on private investments $ 0 $ 0 $ 0 $ 24  
Cost Method Investments 4,400   4,400    
Cost 24,939   24,939   $ 32,717
Gross Unrealized Gains   320 883    
Debt Securities, Trading, Unrealized Loss   (363) (300)    
Investments in trading securities 25,522   25,522   32,674
Cost 26,389   26,389   32,982
Gross Unrealized Gains   327 1,364    
Debt Securities, Trading, and Equity Securities, Unrealized Loss   (394) (312)    
Estimated Fair Value 27,441   27,441   32,915
Long-term Investments 8,944   8,944   7,247
Long-term Investments Carried at Fair Value 1,919   1,919   241
Long-term Investments Carried at Fair Value using NAV 300   300    
Equity Method Investments $ 4,211 4,256 $ 4,211 $ 4,256 $ 4,284
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 $ 3,492   $ 3,492   $ 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%   0.50%
Equity Method Investments $ 700   $ 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%   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 4,211   4,211   4,284
U.S. Government securities          
Equity Securities, FV-NI, Gain (Loss) [Abstract]          
Cost 18,700   18,700   22,522
Gross Unrealized Gains   14 269    
Debt Securities, Trading, Unrealized Loss   (75) (65)    
Investments in trading securities 18,904   18,904   22,461
Money market funds          
Equity Securities, FV-NI, Gain (Loss) [Abstract]          
Cost 4,506   4,506   5,367
Gross Unrealized Gains   111 174    
Debt Securities, Trading, Unrealized Loss   0 0    
Investments in trading securities 4,680   4,680   5,478
Equity funds          
Equity Securities, FV-NI, Gain (Loss) [Abstract]          
Cost 1,405   1,405   4,295
Gross Unrealized Gains   195 370    
Debt Securities, Trading, Unrealized Loss   (260) (127)    
Investments in trading securities 1,648   1,648   4,230
Equity Securities          
Equity Securities, FV-NI, Gain (Loss) [Abstract]          
Cost 170   170   381
Gross Unrealized Gains   0 68    
Debt Securities, Trading, Unrealized Loss   (24) (108)    
Investments in trading securities 130   130   357
us-gaap_EquitySecuritiesMember [Member]          
Equity Securities, FV-NI, Gain (Loss) [Abstract]          
Cost 158   158   152
Gross Unrealized Gains   0 2    
Debt Securities, Trading, Unrealized Loss   (4) 0    
Investments in trading securities 160   160   148
Private investment funds          
Equity Securities, FV-NI, Gain (Loss) [Abstract]          
Cost 1,450   1,450   265
Gross Unrealized Gains   7 481    
Equity Securities, FV-NI, Unrealized Loss   $ (31) (12)    
Estimated Fair Value $ 1,919   $ 1,919   $ 241