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FAIR VALUE MEASUREMENTS (Details) - USD ($)
 3 Months Ended 9 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Sep. 30, 2023
Sep. 30, 2022
Jun. 30, 2023
Dec. 31, 2022
Investments in securities:            
Investments in trading securities $ 31,312,000   $ 31,312,000     $ 15,342,000
Total assets measured at fair value 31,571,000   31,571,000     18,369,000
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]            
Beginning balance 0 $ 4,024,000 2,792,000 $ 4,369,000    
Unrealized gains (losses) on private investments 0 (248,000) 0 (593,000)    
Ending balance 0 $ 3,776,000 0 $ 3,776,000    
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Sales 0   (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 10,246,000   10,246,000   $ 7,763,000 12,901,000
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Gain (Loss) Included in Earnings $ 2,483,000   $ (2,655,000)      
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     $ 10,200,000      
Level 1            
Investments in securities:            
Investments in trading securities $ 31,312,000   31,312,000     15,342,000
Total assets measured at fair value 31,312,000   31,312,000     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 $ 10,246,000   $ 10,246,000     $ 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