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Note E - Pension and Other Postretirement Benefits (Tables)
6 Months Ended
Jun. 30, 2016
Notes Tables  
Schedule of Costs of Retirement Plans [Table Text Block]
   
Pension Benefits
   
Postretirement Benefits
 
   
Three Months Ended
June 30,
   
Three Months Ende
d
June 30,
 
(Dollars in thousands)
  2016     2015     2016     2015  
Service cost
  $ 709     $ 783     $ 298     $ 299  
Interest cost
    661       659       211       199  
Expected return on plan assets
    (983 )     (1,067 )     -       -  
Recognized actuarial loss (gain)
    526       537       (175 )     (164 )
Settlement loss
    -       1,452       -       -  
Net periodic benefit cost
  $ 913     $ 2,364     $ 334     $ 334  
   
Pension Benefits
   
Postretirement Benefits
 
   
Six Months Ended
June 30,
   
Six Months Ended
June 30,
 
(Dollars in thousands)
  2016     2015     2016     2015  
Service cost
  $ 1,418     $ 1,567     $ 596     $ 598  
Interest cost
    1,322       1,318       421       397  
Expected return on plan assets
    (1,965 )     (2,134 )     -       -  
Recognized actuarial loss (gain)
    1,051       1,074       (349 )     (327 )
Settlement loss
    -       1,452       -       -  
Net periodic benefit cost
  $ 1,826     $ 3,277     $ 668     $ 668