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Note 6 - Product Warranties (Tables)
9 Months Ended
Sep. 30, 2019
Notes Tables  
Schedule of Product Warranty Liability [Table Text Block]
   
September
3
0
,
 
   
2019
   
2018
 
Balance at beginning of year
  $
1,380
    $
1,098
 
Provision
   
1,350
     
803
 
Claims
   
(1,254
)
   
(904
)
Balance at end of period
  $
1,476
    $
997