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INVESTMENTS (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Dec. 31, 2024
Equity Securities, FV-NI, Gain (Loss) [Abstract]          
Net change in unrealized appreciation (depreciation) on private investments $ 1,932 $ 0 $ 1,932 $ 0  
Cost 17,104   17,104   $ 25,232
Gross Unrealized Gains   824 917    
Debt Securities, Trading, Unrealized Loss   (308) (315)    
Investments in trading securities 17,706   17,706   25,748
Cost 18,132   18,132   26,788
Gross Unrealized Gains   1,226 1,942    
Debt Securities, Trading, and Equity Securities, Unrealized Loss   (320) (345)    
Estimated Fair Value 19,729   19,729   27,694
Equity Method Investments 4,263 4,211 4,263 $ 4,211 4,250
Investment Owned, at Fair Value 19,729   19,729   27,694
Investments under fair value measurement alternative 14,697   14,697   10,747
Total investments 38,689   38,689   42,691
InvestCloud private investment 4,455   4,455   4,455
Investment carrying value - Vista 2,792   2,792   2,792
WEBs - preferred stock 2,799   2,799   1,799
WEBs - call option 201   201   201
TXSE - private investment 3,450   3,450   1,500
Investment carrying value - Ridgeline 1,000   1,000    
Total investments under measurement alternative $ 14,697   $ 14,697   $ 10,747
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 $ 3,513   $ 3,513   $ 3,524
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 $ 731   $ 731   $ 707
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 4,263   4,263   4,250
U.S. Government securities          
Equity Securities, FV-NI, Gain (Loss) [Abstract]          
Cost 7,240   7,240   15,859
Gross Unrealized Gains   263 284    
Debt Securities, Trading, Unrealized Loss   (66) (80)    
Investments in trading securities 7,444   7,444   16,056
Money market funds          
Equity Securities, FV-NI, Gain (Loss) [Abstract]          
Cost 8,800   8,800   7,629
Gross Unrealized Gains   174 174    
Debt Securities, Trading, Unrealized Loss   0 0    
Investments in trading securities 8,974   8,974   7,803
Equity funds          
Equity Securities, FV-NI, Gain (Loss) [Abstract]          
Cost 595   595   1,432
Gross Unrealized Gains   318 355    
Debt Securities, Trading, Unrealized Loss   (132) (127)    
Investments in trading securities 823   823   1,618
Equity Securities          
Equity Securities, FV-NI, Gain (Loss) [Abstract]          
Cost 321   321   183
Gross Unrealized Gains   69 102    
Debt Securities, Trading, Unrealized Loss   (108) (108)    
Investments in trading securities 315   315   144
us-gaap_EquitySecuritiesMember [Member]          
Equity Securities, FV-NI, Gain (Loss) [Abstract]          
Cost 148   148   129
Gross Unrealized Gains   0 2    
Debt Securities, Trading, Unrealized Loss   (2) 0    
Investments in trading securities 150   150   127
Private investment funds          
Equity Securities, FV-NI, Gain (Loss) [Abstract]          
Cost 1,028   1,028   1,556
Gross Unrealized Gains   402 1,025    
Equity Securities, FV-NI, Unrealized Loss   $ (12) (30)    
Estimated Fair Value $ 2,023   $ 2,023   $ 1,946