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Note 6 - Product Warranties (Tables)
6 Months Ended
Jun. 30, 2018
Notes Tables  
Schedule of Product Warranty Liability [Table Text Block]
   
June
3
0
,
 
   
2018
   
2017
 
Balance at beginning of year
  $
1,098
    $
1,435
 
Provision
   
586
     
815
 
Claims
   
(686
)
   
(1,012
)
Balance at end of period
  $
998
    $
1,238