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Note 5 - Product Warranties (Tables)
9 Months Ended
Sep. 30, 2017
Notes Tables  
Schedule of Product Warranty Liability [Table Text Block]
   
September
3
0
,
 
   
2017
   
2016
 
Balance at beginning of year
  $
1,435
    $
1,380
 
Provision
   
1,058
     
1,572
 
Claims
   
(1,360
)
   
(1,418
)
Balance at end of period
  $
1,133
    $
1,534