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5. Long-Term Debt (Details) - USD ($)
$ in Thousands
Sep. 30, 2021
Dec. 31, 2020
Debt Instrument [Line Items]    
Other Long-term Debt, Current $ 1,700 $ 1,800
Long-term debt, net of current maturities 10,645 12,258
Finance Lease Obligations [Member] | Finance Leases and Other Debt [Member]    
Debt Instrument [Line Items]    
Other Long-term Debt $ 12,300 $ 14,100