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Note 6 - Contingencies (Tables)
 6 Months Ended
Jun. 30, 2017
Notes Tables  
Schedule of Product Warranty Liability [Table Text Block]
 
 
Six
Months Ended
June 30, 2017
 
 
Year
Ended
December 31,
201
6
 
   
(unaudited)
          
Beginning balance
   $
236
     $
187
  
Cost of warranty claims
    
(26
)
    
(157
)
Accruals for product warranties
    
34
      
206
  
Ending balance
   $
244
     $
236