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Note 5 - Product Warranties (Tables)
6 Months Ended
Jun. 30, 2017
Notes Tables  
Schedule of Product Warranty Liability [Table Text Block]
 
 
June 30,
 
 
 
2017
 
 
2016
 
Balance at beginning of year
  $
1,435
    $
1,380
 
Provision
   
815
     
1,160
 
Claims
   
(1,012
)
   
(884
)
Balance at end of period
  $
1,238
    $
1,656