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Note 6 - Product Warranties (Tables)
3 Months Ended
Mar. 31, 2019
Notes Tables  
Schedule of Product Warranty Liability [Table Text Block]
   
March 31,
 
   
2019
   
2018
 
Balance at beginning of year
 
  $
1,380
    $
1,098
 
Provision
 
   
479
     
378
 
Claims
 
   
(355
)
   
(415
)
Balance at end of period
 
  $
1,504
    $
1,061