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SALE OF A BUSINESS (Details)
1 Months Ended 3 Months Ended
Aug. 31, 2018
USD ($)
installment
Mar. 31, 2021
USD ($)
Mar. 31, 2020
USD ($)
Dec. 31, 2020
USD ($)
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]        
Proceeds from the sale of business   $ 3,000,000 $ 0  
Long-term receivable   $ 0   $ 2,531,000
Rental Property Management Business | Discontinued Operations, Disposed of by Sale        
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]        
Total proceeds from the sale of business $ 18,000,000.0      
Number of installment payments | installment 2      
Proceeds from the sale of business $ 15,000,000.0      
Future proceeds from the sale of business $ 3,000,000.0