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Note 7 - Restructuring Charges (Details Textual)
$ in Thousands
12 Months Ended
Dec. 31, 2021
USD ($)
Dec. 31, 2020
USD ($)
Restructuring Charges, Total $ 327 $ 0
Consolidation of our Production Facilities and Closure of our Merrifield, Minnesota Facility [Member]    
Restructuring Charges, Total 327  
Restructuring Reserve, Ending Balance $ 0  
Restructuring and Related Cost, Number of Positions Eliminated 42