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Note E - Pension and Other Postretirement Benefits (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Pension Plan [Member]        
Service cost $ 709 $ 783 $ 1,418 $ 1,567
Interest cost 661 659 1,322 1,318
Expected return on plan assets (983) (1,067) (1,965) (2,134)
Recognized actuarial loss (gain) 526 537 1,051 1,074
Settlement loss 1,452 1,452
Net periodic benefit cost 913 2,364 1,826 3,277
Service cost 709 783 1,418 1,567
Interest cost 661 659 1,322 1,318
Expected return on plan assets (983) (1,067) (1,965) (2,134)
Recognized actuarial loss (gain) 526 537 1,051 1,074
Settlement loss 1,452 1,452
Postretirement Benefits [Member]        
Service cost 298 299 596 598
Interest cost 211 199 421 397
Expected return on plan assets
Recognized actuarial loss (gain) (175) (164) (349) (327)
Settlement loss
Net periodic benefit cost 334 334 668 668
Service cost 298 299 596 598
Interest cost 211 199 421 397
Expected return on plan assets
Recognized actuarial loss (gain) (175) (164) (349) (327)
Settlement loss