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Note 6 - Restructuring and Other Exit Costs (Details Textual) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Restructuring Reserve, Ending Balance $ 288 $ 368
Restructuring Charges, Total 2,033 1,354
Selling, General and Administrative Expenses [Member]    
Restructuring Charges, Total $ 2,000 700
Impairment Charges [Member]    
Restructuring Charges, Total   500
Cost of Sales [Member]    
Restructuring Charges, Total   200
Facility Closing [Member]    
Restructuring Charges, Total   $ 500