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Debt Financing and Revolving Credit Facilities (Long-Term Debt) (Details) - USD ($)
$ in Thousands
Mar. 31, 2021
Dec. 31, 2020
Nov. 24, 2020
Debt Instrument [Line Items]      
Total Debt $ 67,235 $ 66,979  
Total debt, net of discount and deferred financing costs 56,126 55,273  
Less amounts due within one year (19,315) (17,605)  
Long-term debt, net of current portion 36,811 37,668  
M&T Credit Agreement [Member]      
Debt Instrument [Line Items]      
Total Debt 9,940 10,105  
Paycheck Protection Program Loan [Member]      
Debt Instrument [Line Items]      
Total Debt 10,000 10,000  
Siena Loan Agreement [Member]      
Debt Instrument [Line Items]      
Total Debt 7,039 6,874  
deferred financing costs   (1,101)  
Term Loan Credit Agreement [Member]      
Debt Instrument [Line Items]      
Total Debt 40,256 40,000  
discount (8,438) (8,892)  
deferred financing costs $ (2,671) $ (2,814) $ (2,872)