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LEASES - Future minimum lease payments (Details)
3 Months Ended
Mar. 31, 2020
USD ($)
Maturity of lease liabilities  
2020 $ 176,625
2021 235,500
2022 $ 58,875
Initial lease term (in months) 36 months
Total received leases $ 471,000
Rental income 59,000
ASU No. 2016-02, Leases (Topic 842)  
Maturity of lease liabilities  
2020 39,000
2021 52,000
2022 52,000
2023 10,000
Total lease payments 153,000
Less: Amounts representing interest (8,000)
Lease liabilities $ 145,000