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Note 6 - Product Warranties
3 Months Ended
Mar. 31, 2020
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:
 
   
March 31
,
 
   
2020
   
2019
 
Balance at beginning of year
  $
1,438
    $
1,380
 
Provision
   
294
     
479
 
Claims
   
(302
)
   
(355
)
Balance at end of period
  $
1,430
    $
1,504