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Note 7 - Accrued Liabilities (Tables)
12 Months Ended
Dec. 31, 2017
Notes Tables  
Schedule of Accrued Liabilities [Table Text Block]
   
As of December 31,
 
   
2017
   
2016
 
Accrued salaries and other compensation
  $
1,072
    $
1,098
 
Sales and marketing programs
   
435
     
319
 
Product warranty
   
245
     
246
 
Other accrued liabilities
   
91
     
231
 
Total
  $
1,843
    $
1,894