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Note E - Summary of Components of Net Periodic Benefit Cost (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Pension Plan [Member]        
Service cost $ 783 $ 726 $ 1,567 $ 1,452
Interest cost 659 728 1,318 1,448
Expected return on plan assets (1,067) (1,170) (2,134) (2,378)
Recognized actuarial loss (gain) 537 $ 457 1,074 $ 915
Settlement loss 1,452   1,452  
Net periodic benefit cost 2,364 $ 741 3,277 $ 1,437
Postretirement Benefits [Member]        
Service cost 299 226 598 453
Interest cost $ 199 $ 212 $ 397 $ 424
Expected return on plan assets        
Recognized actuarial loss (gain) $ (164) $ (380) $ (327) $ (577)
Settlement loss        
Net periodic benefit cost $ 334 $ 58 $ 668 $ 300
Settlement loss $ 1,500