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Note 6 - Product Warranties
6 Months Ended
Jun. 30, 2018
Notes to Financial Statements  
Product Warranty Disclosure [Text Block]
NOTE
6
- 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
3
0
,
 
   
2018
   
2017
 
Balance at beginning of year
  $
1,098
    $
1,435
 
Provision
   
586
     
815
 
Claims
   
(686
)
   
(1,012
)
Balance at end of period
  $
998
    $
1,238