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Note E - Pension and Other Postretirement Benefits (Tables)
3 Months Ended
Mar. 31, 2016
Notes Tables  
Schedule of Costs of Retirement Plans [Table Text Block]
   
Pension Benefits
   
Postretirement Benefits
 
   
Three Months Ended
   
Three Months Ended
 
   
March 31,
   
March 31,
 
   
2016
   
2015
   
2016
   
2015
 
(Dollars in thousands)
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Service cost
  $ 709     $ 784     $ 298     $ 299  
Interest cost
    661       659       210       198  
Expected return on plan assets
    (982 )     (1,067 )     -       -  
Recognized actuarial loss (gain)
    525       537       (174 )     (163 )
Net periodic benefit cost
  $ 913     $ 913     $ 334     $ 334