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Note 5 - Product Warranties
6 Months Ended
Jun. 30, 2017
Notes to Financial Statements  
Product Warranty Disclosure [Text Block]
NOTE
5
- PRODUCT WARRANTIES
 
A liability is established for estimated future warranty and service claims based on historical claims experience and specific product failures. The Company expenses warranty costs directly to cost of products sold. Changes in the Company’s product warranty liability are:
 
 
 
 
 
June 30,
 
 
 
2017
 
 
2016
 
Balance at beginning of year
  $
1,435
    $
1,380
 
Provision
   
815
     
1,160
 
Claims
   
(1,012
)
   
(884
)
Balance at end of period
  $
1,238
    $
1,656