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Note 5 - Warranty (Tables)
3 Months Ended
Mar. 31, 2017
Notes Tables  
Schedule of Product Warranty Liability [Table Text Block]
 
 
Three Months Ended
 
 
 
March 31,
 
 
 
2017
 
 
2016
 
Beginning balance
  $
209
    $
223
 
Warranty provisions
   
132
     
144
 
Warranty claims
   
(137
)    
(125
)
Ending Balance
  $
204
    $
242