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LEASES - Supplemental Balance Sheet Information (Details) - USD ($)
Mar. 31, 2021
Dec. 31, 2020
Operating leases    
Operating lease right-of-use assets $ 5,241,000 $ 5,494,000
Operating lease liabilities - current 1,089,000 1,109,000
Operating lease liabilities - long-term 4,659,000 4,899,000
Total operating lease liabilities 5,748,000 6,008,000
Finance leases    
Property and equipment, at cost 8,663,000 8,663,000
Accumulated depreciation (5,229,000) (4,624,000)
Property and equipment, net 3,434,000 4,039,000
Finance lease liabilities - current 50,000 54,000
Finance lease liabilities - long-term 36,000 44,000
Total finance lease liabilities $ 86,000 $ 98,000
Weighted average remaining lease term:    
Operating leases 5 years 4 months 24 days 5 years 7 months 6 days
Finance leases 1 year 3 months 18 days 1 year 7 months 6 days
Weighted average discount rate:    
Operating leases 5.04% 5.04%
Finance leases 5.00% 5.00%