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INVESTMENTS (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2022
Mar. 31, 2022
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2022
Jun. 30, 2021
Dec. 31, 2021
Debt Securities, Trading, Gain (Loss) [Abstract]              
Cost $ 52,788       $ 52,788   $ 65,158
Gross Unrealized Gains   $ 364     0    
Gross Unrealized Losses   (498)     (1,182)    
Debt Securities, Trading 51,606       51,606   65,024
Equity Securities, FV-NI, Gain (Loss) [Abstract]              
Cost 56,473       56,473   68,843
Gross Unrealized Gains   1,313     604    
Gross Unrealized Losses   (619)     (1,222)    
Estimated Fair Value 55,855       55,855   69,537
Net change in unrealized appreciation (depreciation) on private investments (299) 2,800 $ 215   (262) $ (2,111)  
Unrealized Gain on Securities     $ 200   (300)    
Realized Investment Gains (Losses)   8,300   $ 46 (8,371) 8,371  
Unrealized Loss on Securities           $ 700  
Cost Method Investments 4,400       4,400    
U.S. Government and Government agency obligations              
Debt Securities, Trading, Gain (Loss) [Abstract]              
Cost 40,570       40,570   39,926
Gross Unrealized Gains   0     0    
Gross Unrealized Losses   (491)     (566)    
Debt Securities, Trading 40,004       40,004   39,435
Money market funds              
Debt Securities, Trading, Gain (Loss) [Abstract]              
Cost 6,016       6,016   19,661
Gross Unrealized Gains   0     0    
Gross Unrealized Losses   0     0    
Debt Securities, Trading 6,016       6,016   19,661
Equity funds              
Debt Securities, Trading, Gain (Loss) [Abstract]              
Cost 4,760       4,760   4,135
Gross Unrealized Gains   158     0    
Gross Unrealized Losses   (7)     (553)    
Debt Securities, Trading 4,207       4,207   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     604    
Gross Unrealized Losses   0     0    
Estimated Fair Value 4,024       4,024   4,369
Equity Securities              
Debt Securities, Trading, Gain (Loss) [Abstract]              
Cost 1,295       1,295   1,296
Gross Unrealized Gains   206     0    
Gross Unrealized Losses   0     (45)    
Debt Securities, Trading 1,250       1,250   1,502
us-gaap_EquitySecuritiesMember [Member]              
Debt Securities, Trading, Gain (Loss) [Abstract]              
Cost 147       147   140
Gross Unrealized Gains   0     0    
Gross Unrealized Losses   $ 0     (18)    
Debt Securities, Trading $ 129       $ 129   $ 140