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INVESTMENTS (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended 9 Months Ended
Sep. 30, 2022
Sep. 30, 2021
Sep. 30, 2020
Jun. 30, 2022
Sep. 30, 2022
Sep. 30, 2021
Dec. 31, 2021
Debt Securities, Trading, Gain (Loss) [Abstract]              
Cost $ 52,983       $ 52,983   $ 65,158
Gross Unrealized Gains       $ 364 128    
Gross Unrealized Losses       (498) (1,547)    
Debt Securities, Trading 51,564       51,564   65,024
Equity Securities, FV-NI, Gain (Loss) [Abstract]              
Cost 56,668       56,668   68,843
Gross Unrealized Gains       1,313 484    
Gross Unrealized Losses       (619) (1,587)    
Estimated Fair Value 55,565       55,565   69,537
Net change in unrealized appreciation (depreciation) on private investments (249) $ (13)     (511) $ (2,124)  
Unrealized Gain on Securities         (600) 700  
Realized Investment Gains (Losses)     $ 0 8,300 (8,371) $ 8,371  
Cost Method Investments 4,400       4,400    
U.S. Government and Government agency obligations              
Debt Securities, Trading, Gain (Loss) [Abstract]              
Cost 33,931       33,931   39,926
Gross Unrealized Gains       0 0    
Gross Unrealized Losses       (491) (557)    
Debt Securities, Trading 33,374       33,374   39,435
Money market funds              
Debt Securities, Trading, Gain (Loss) [Abstract]              
Cost 12,760       12,760   19,661
Gross Unrealized Gains       0 128    
Gross Unrealized Losses       0 0    
Debt Securities, Trading 12,888       12,888   19,661
Equity funds              
Debt Securities, Trading, Gain (Loss) [Abstract]              
Cost 4,861       4,861   4,135
Gross Unrealized Gains       158 0    
Gross Unrealized Losses       (7) (779)    
Debt Securities, Trading 4,082       4,082   4,286
Private investment fund              
Equity Securities, FV-NI, Gain (Loss) [Abstract]              
Cost 265       265   265
Gross Unrealized Gains       0 0    
Gross Unrealized Losses       (121) (40)    
Estimated Fair Value 225       225   144
Private equity              
Equity Securities, FV-NI, Gain (Loss) [Abstract]              
Cost 3,420       3,420   3,420
Gross Unrealized Gains       949 356    
Gross Unrealized Losses       0 0    
Estimated Fair Value 3,776       3,776   4,369
Equity Securities              
Debt Securities, Trading, Gain (Loss) [Abstract]              
Cost 1,276       1,276   1,296
Gross Unrealized Gains       206 0    
Gross Unrealized Losses       0 (188)    
Debt Securities, Trading 1,088       1,088   1,502
us-gaap_EquitySecuritiesMember [Member]              
Debt Securities, Trading, Gain (Loss) [Abstract]              
Cost 155       155   140
Gross Unrealized Gains       0 0    
Gross Unrealized Losses       $ 0 (23)    
Debt Securities, Trading $ 132       $ 132   $ 140