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Note D - Pension And Other Postretirement Benefits (Tables)
3 Months Ended
Mar. 31, 2013
Schedule of Costs of Retirement Plans [Table Text Block]
   
Pension Benefits
   
Postretirement Benefits
 
(Thousands of dollars)
 
Three Months Ended
March 31,
   
Three Months Ended
March 31,
 
   
2013
   
2012
   
2013
   
2012
 
Service cost
  $ 849     $ 797     $ 288     $ 289  
Interest cost
    666       701       182       218  
Expected return on plan assets
    (1,293 )     (1,148 )     -       -  
Recognized actuarial loss (gain)
    612       610       (181 )     (162 )
Settlement loss
    1,386       -       -       -  
Net periodic benefit cost
  $ 2,220     $ 960     $ 289     $ 345