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FAIR VALUE MEASUREMENTS (Details) - USD ($)
 3 Months Ended 6 Months Ended
Jun. 30, 2023
Jun. 30, 2022
Jun. 30, 2023
Jun. 30, 2022
Mar. 31, 2023
Dec. 31, 2022
Investments in securities:            
Investments in trading securities $ 22,894,000   $ 22,894,000     $ 15,342,000
Total assets measured at fair value 23,153,000   23,153,000     18,369,000
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]            
Beginning balance 2,792,000 $ 4,326,000 2,792,000 $ 4,369,000    
Unrealized gains (losses) on private investments 0 (302,000) 0 (345,000)    
Ending balance 0 $ 4,024,000 0 $ 4,024,000    
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Sales (2,792,000)   (2,792,000)      
Fair Value Inputs [Abstract] (Deprecated 2018-01-31)            
Long-term Investments 7,247,000   7,247,000     4,455,000
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability Value 7,763,000   7,763,000   $ 11,841,000 12,901,000
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Gain (Loss) Included in Earnings $ (4,078,000)   $ (5,138,000)      
Unobservable input - revenue retention discount rate - maximum true   true      
Unobservable input - revenue retention discount rate - weighted average true   true      
Unobservable input - revenue retention discount rate - minimum true   true      
Unobservable input - revenue retention volatility - weighted average true   true      
Unobservable input - revenue retention volatility - maximum true   true      
Unobservable input - revenue retention volatility - minimum true   true      
Unobservable input - growth discount rate - weighted average true   true      
Unobservable input - growth discount rate - maximum true   true      
Unobservable input - growth discount rate - minimum true   true      
Unobservable input - growth volatility - weighted average true   true      
Unobservable input - growth volatility - maximum true   true      
Unobservable input - growth volatility - minimum true   true      
Asset Acquisition, Consideration Transferred, Contingent Consideration     $ 7,800,000      
Level 1            
Investments in securities:            
Investments in trading securities $ 22,894,000   22,894,000     15,342,000
Total assets measured at fair value 22,894,000   22,894,000     15,342,000
Level 2            
Investments in securities:            
Investments in trading securities 0   0     0
Total assets measured at fair value 0   0     0
Level 3            
Investments in securities:            
Investments in trading securities 0   0     0
Total assets measured at fair value $ 0   $ 0     $ 2,792,000
Asset Acquisition, Consideration Transferred, Contingent Consideration Level 3   Level 3     Level 3
Other Liabilities, Fair Value Disclosure $ 7,763,000   $ 7,763,000     $ 12,901,000
Investments Measured at NAV            
Investments in securities:            
Investments in trading securities 0   0     0
Total assets measured at fair value $ 259,000   $ 259,000     $ 235,000
Fair Value, Recurring            
Investments in securities:            
Asset Acquisition, Consideration Transferred, Contingent Consideration Fair Value, Inputs, Level 1, Level 2, and Level 3 [Member]   Fair Value, Inputs, Level 1, Level 2, and Level 3 [Member]     Fair Value, Inputs, Level 1, Level 2, and Level 3 [Member]
Private investment fund            
Investments in securities:            
Private $ 259,000   $ 259,000     $ 235,000
Private investment fund | Level 1            
Investments in securities:            
Private 0   0     0
Private investment fund | Level 2            
Investments in securities:            
Private 0   0     0
Private investment fund | Level 3            
Investments in securities:            
Private 0   0     0
Private investment fund | Investments Measured at NAV            
Investments in securities:            
Private $ 259,000   $ 259,000     235,000
Private equity            
Investments in securities:            
Private           2,792,000
Private equity | Level 1            
Investments in securities:            
Private           0
Private equity | Level 2            
Investments in securities:            
Private           0
Private equity | Level 3            
Investments in securities:            
Private           2,792,000
Private equity | Investments Measured at NAV            
Investments in securities:            
Private           $ 0