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Debt - Maturities (Details) - USD ($)
Dec. 31, 2020
Dec. 31, 2019
Aggregate maturities of finance leases    
January 2021 - December 2021 $ 54,000  
January 2022 - December 2022 36,000  
January 2023 - December 2023 8,000  
Obligations under finance leases $ 98,000 $ 2,412,000
Minimum    
Aggregate maturities of finance leases    
Interest rate on leases 4.83%  
Maximum    
Aggregate maturities of finance leases    
Interest rate on leases 5.37%