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INVESTMENTS (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2024
Jun. 30, 2023
Jun. 30, 2024
Jun. 30, 2023
Dec. 31, 2023
Equity Securities, FV-NI, Gain (Loss) [Abstract]          
Net change in unrealized appreciation (depreciation) on private investments $ 0 $ 24 $ 0 $ 24  
Cost Method Investments 4,400   4,400    
Cost 19,971   19,971   $ 32,717
Gross Unrealized Gains   320 693    
Debt Securities, Trading, Unrealized Loss   (363) (300)    
Investments in trading securities 20,364   20,364   32,674
Cost 21,421   21,421   32,982
Gross Unrealized Gains   327 1,092    
Debt Securities, Trading, and Equity Securities, Unrealized Loss   (394) (324)    
Estimated Fair Value 22,189   22,189   32,915
Long-term Investments 8,747   8,747   7,247
Long-term Investments Carried at Fair Value 1,825   1,825   241
Long-term Investments Carried at Fair Value using NAV 300   300    
Equity Method Investments $ 4,578 4,180 $ 4,578 $ 4,180 $ 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 $ 3,859   $ 3,859   $ 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 4,578   4,578   4,284
U.S. Government securities          
Equity Securities, FV-NI, Gain (Loss) [Abstract]          
Cost 12,653   12,653   22,522
Gross Unrealized Gains   14 233    
Debt Securities, Trading, Unrealized Loss   (75) (66)    
Investments in trading securities 12,820   12,820   22,461
Money market funds          
Equity Securities, FV-NI, Gain (Loss) [Abstract]          
Cost 4,293   4,293   5,367
Gross Unrealized Gains   111 138    
Debt Securities, Trading, Unrealized Loss   0 0    
Investments in trading securities 4,431   4,431   5,478
Equity funds          
Equity Securities, FV-NI, Gain (Loss) [Abstract]          
Cost 1,507   1,507   4,295
Gross Unrealized Gains   195 265    
Debt Securities, Trading, Unrealized Loss   (260) (123)    
Investments in trading securities 1,649   1,649   4,230
Equity Securities          
Equity Securities, FV-NI, Gain (Loss) [Abstract]          
Cost 169   169   381
Gross Unrealized Gains   0 57    
Debt Securities, Trading, Unrealized Loss   (24) (108)    
Investments in trading securities 118   118   357
us-gaap_EquitySecuritiesMember [Member]          
Equity Securities, FV-NI, Gain (Loss) [Abstract]          
Cost 149   149   152
Gross Unrealized Gains   0 0    
Debt Securities, Trading, Unrealized Loss   (4) (3)    
Investments in trading securities 146   146   148
Private investment funds          
Equity Securities, FV-NI, Gain (Loss) [Abstract]          
Cost 1,450   1,450   265
Gross Unrealized Gains   7 399    
Equity Securities, FV-NI, Unrealized Loss   $ (31) (24)    
Estimated Fair Value 1,825   1,825   $ 241
Exchange Traded Funds          
Equity Securities, FV-NI, Gain (Loss) [Abstract]          
Cost 1,200   1,200    
Gross Unrealized Gains     0    
Debt Securities, Trading, Unrealized Loss     0    
Investments in trading securities $ 1,200   $ 1,200