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Note 19 - Warranties (Tables)
12 Months Ended
Dec. 31, 2019
Notes Tables  
Schedule of Product Warranty Liability [Table Text Block]
    Beginning       (Charges)\   Ending
    Balance   Additions   Credits   Balance
    (in thousands)
Year ended December 31, 2018   $
246
     
182
     
(37
)   $
391
 
Year ended December 31, 2019   $
391
     
10
     
(149
)   $
252