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Note 9 - Other Current Liabilities (Tables)
12 Months Ended
Dec. 31, 2020
Notes Tables  
Current Liabilities [Table Text Block]
   
2020
   
2019
 
Accrued restructuring
  $
340
    $
-
 
Accrued warranty
   
235
     
334
 
Other
   
229
     
163
 
Total other current liabilities
  $
804
    $
497