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Note E - Pension and Other Postretirement Benefits (Tables)
6 Months Ended
Jun. 30, 2015
Notes Tables  
Schedule of Costs of Retirement Plans [Table Text Block]
   
Pension Benefits
   
Postretirement Benefits
 
   
Three Months Ended June 30,
   
Three Months Ended June 30,
 
(Dollars in thousands)
 
2015
   
2014
   
2015
   
2014
 
Service cost
  $ 783     $ 726     $ 299     $ 226  
Interest cost
    659       728       199       212  
Expected return on plan assets
    (1,067 )     (1,170 )     -       -  
Recognized actuarial loss (gain)
    537       457       (164 )     (380 )
Settlement loss
    1,452       -       -       -  
Net periodic benefit cost
  $ 2,364     $ 741     $ 334     $ 58  
   
Pension Benefits
   
Postretirement Benefits
 
   
Six Months Ended June 30,
   
Six Months Ended June 30,
 
(Dollars in thousands)
 
2015
   
2014
   
2015
   
2014
 
Service cost
  $ 1,567     $ 1,452     $ 598     $ 453  
Interest cost
    1,318       1,448       397       424  
Expected return on plan assets
    (2,134 )     (2,378 )     -       -  
Recognized actuarial loss (gain)
    1,074       915       (327 )     (577 )
Settlement loss
    1,452       -       -       -  
Net periodic benefit cost
  $ 3,277     $ 1,437     $ 668     $ 300