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NOTES RECEIVABLE - Narrative (Details) - USD ($)
3 Months Ended
Mar. 31, 2022
Mar. 31, 2021
Dec. 31, 2021
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Impairment of notes receivable $ 0 $ 0  
Promissory Notes Receivable      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Promissory note receivable 4,299,000   $ 4,337,000
Promissory note receivable, current 158,000   156,000
Promissory note receivable, noncurrent $ 4,141,000   $ 4,181,000