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Short-Term and Long-Term Debt, Including Finance Leases - Long-term debt instruments (Details) - USD ($)
Dec. 31, 2020
Dec. 31, 2019
Debt Instrument [Line Items]    
Finance lease and other obligations $ 740,000 $ 77,000
Total long-term debt and finance leases 113,595,000 176,954,000
Less: portion of Credit Facility classified as short-term (1,837,000) (28,546,000)
Less: current installments of finance leases and other obligations (267,000) (15,000)
Total long-term debt and finance leases, less current installments 111,758,000 148,408,000
Credit Facility    
Debt Instrument [Line Items]    
Credit Facility 112,855,000 176,877,000
Less: portion of Credit Facility classified as short-term $ (1,570,000) $ (28,531,000)