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Operating Leases - Future Minimum Lease Payments (Details) - USD ($)
Mar. 31, 2021
Dec. 31, 2020
Finance Minimum Lease Payments    
2021 $ 312,000  
2022 239,000  
2023 27,000  
Total lease payments 578,000  
Less: Amounts representing interest (42,000)  
Present value of lease liabilities $ 536,000 $ 624,000