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Note 4 - Financing Arrangements - Long-term Debt (Details) - USD ($)
$ in Thousands
Mar. 31, 2021
Dec. 31, 2020
Long-term debt gross $ 7,023 $ 7,148
Debt issuance Costs (64) (79)
Total long-term debt 6,959 7,069
Current maturities of long-term debt (1,964) (1,204) [1]
Long-term debt - net of current maturities 4,995 5,865
Real Estate Term Note [Member]    
Long-term debt gross 946 1,071
Paycheck Protection Program CARES Act [Member]    
Long-term debt gross $ 6,077 $ 6,077
[1] The balance sheet at December 31, 2020 has been derived from the audited financial statements at that date