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FAIR VALUE MEASUREMENTS (Details) - USD ($)
 3 Months Ended 9 Months Ended
Sep. 30, 2024
Sep. 30, 2023
Sep. 30, 2024
Sep. 30, 2023
Jun. 30, 2024
Dec. 31, 2023
Mar. 31, 2023
Dec. 31, 2022
Investments in securities:                
Investments in trading securities $ 25,522,000   $ 25,522,000     $ 32,674,000    
Total assets measured at fair value 27,441,000   27,441,000     32,915,000    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]                
Beginning balance   $ 0   $ 2,792,000        
Ending balance   0   0        
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 8,944,000   8,944,000     7,247,000    
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability Value 12,000,000 10,246,000 12,000,000 10,246,000 $ 10,176,000 10,133,000 $ 7,763,000 $ 12,901,000
Payment for Contingent Consideration Liability, Financing Activities 0   (1,815,000)          
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Gain (Loss) Included in Earnings $ 1,824,000 $ 2,483,000 $ 3,682,000 $ (2,655,000)        
Unobservable input - revenue retention discount rate - maximum true true true true        
Unobservable input - revenue retention discount rate - weighted average true true true true        
Unobservable input - revenue retention discount rate - minimum true true true true        
Unobservable input - revenue retention volatility - weighted average true true true true        
Unobservable input - revenue retention volatility - maximum true true true true        
Unobservable input - revenue retention volatility - minimum true true true true        
Unobservable input - growth discount rate - weighted average true true true true        
Unobservable input - growth discount rate - maximum true true true true        
Unobservable input - growth discount rate - minimum true true true true        
Unobservable input - growth volatility - weighted average true true true true        
Unobservable input - growth volatility - maximum true true true true        
Unobservable input - growth volatility - minimum true true true true        
Asset Acquisition, Consideration Transferred, Contingent Consideration     $ 12,000,000          
Level 1                
Investments in securities:                
Investments in trading securities $ 25,522,000   25,522,000     32,674,000    
Total assets measured at fair value 25,522,000   25,522,000     32,674,000    
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     $ 0    
Asset Acquisition, Consideration Transferred, Contingent Consideration Level 3   Level 3     Level 3    
Other Liabilities, Fair Value Disclosure $ 12,000,000   $ 12,000,000     $ 10,133,000    
Investments Measured at NAV                
Investments in securities:                
Investments in trading securities 0   0     0    
Total assets measured at fair value $ 1,919,000   $ 1,919,000     $ 241,000    
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]    
Other Liabilities, Fair Value Disclosure $ 12,000,000   $ 12,000,000     $ 10,133,000    
Private investment funds                
Investments in securities:                
Private 1,919,000   1,919,000     241,000    
Private investment funds | Level 1                
Investments in securities:                
Private 0   0     0    
Private investment funds | Level 2                
Investments in securities:                
Private 0   0     0    
Private investment funds | Level 3                
Investments in securities:                
Private 0   0     0    
Private investment funds | Investments Measured at NAV                
Investments in securities:                
Private $ 1,919,000   $ 1,919,000     $ 241,000