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Note 8 - Other Current Liabilities (Tables)
12 Months Ended
Dec. 31, 2019
Notes Tables  
Current Liabilities [Table Text Block]
   
2019
   
2018
 
Accrued warranty
  $
334
    $
346
 
Accrued rent/facility costs
   
25
     
406
 
Other
   
138
     
356
 
Total other current liabilities
  $
497
    $
1,108