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Note C - Product Warranties
6 Months Ended
Jun. 30, 2012
Product Warranty Disclosure [Text Block]
NOTE C - PRODUCT WARRANTIES

A liability is established for estimated future warranty and service claims based on historical claims experience, specific product failures and sales volume.  The Company expenses warranty costs directly to cost of products sold.  Changes in the Company’s product warranty liability are as follows:

(Thousands of dollars)
 
June 30,
 
   
2012
   
2011
 
Balance at beginning of year
  $ 1,228     $ 1,543  
Provision
    443       610  
Claims
    (678 )     (717 )
Balance at end of period
  $ 993     $ 1,436