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Note 6 - Product Warranties
9 Months Ended
Sep. 30, 2019
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 warranties liability are:
 
 
   
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