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Note C - Product Warranties
3 Months Ended
Mar. 31, 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)
 
March 31,
 
   
2012
   
2011
 
Balance at beginning of year
  $ 1,228     $ 1,543  
Provision
    86       467  
Claims
    (311 )     (377 )
Balance at end of period
  $ 1,003     $ 1,633