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Note 6 - Product Warranties (Tables)
6 Months Ended
Jun. 30, 2019
Notes Tables  
Schedule of Product Warranty Liability [Table Text Block]
   
June
3
0,
 
   
2019
   
2018
 
Balance at beginning of year
  $
1,380
    $
1,098
 
Provision
   
948
     
586
 
Claims
   
(822
)
   
(686
)
Balance at end of period
  $
1,506
    $
998