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Note 6 - Product Warranties (Tables)
9 Months Ended
Sep. 30, 2018
Notes Tables  
Schedule of Product Warranty Liability [Table Text Block]
   
September 30,
 
   
2018
   
2017
 
Balance at beginning of year
  $
1,098
    $
1,435
 
Provision
   
803
     
1,058
 
Claims
   
(904
)
   
(1,360
)
Balance at end of period
  $
997
    $
1,133