XML 29 R19.htm IDEA: XBRL DOCUMENT v3.8.0.1
Note 6 - Product Warranties (Tables)
3 Months Ended
Mar. 31, 2018
Notes Tables  
Schedule of Product Warranty Liability [Table Text Block]
   
March
3
1
,
 
   
201
8
   
201
7
 
Balance at beginning of year
  $
1,098
    $
1,435
 
Provision
   
378
     
606
 
Claims
   
(415
)
   
(530
)
Balance at end of period
  $
1,061
    $
1,511