Note K - Accumulated Other Comprehensive Income (Loss) - Schedule of Accumulated Other Comprehensive Income (Loss) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023
Balance	$ 1,381,425	$ 1,414,067	$ 1,368,702	$ 1,412,506
Balance	1,465,386	1,443,204	1,465,386	1,443,204
Accumulated Defined Benefit Plans Adjustment Attributable to Parent [Member]
Balance	(55,947)	(99,713)	(57,931)	(103,418)
Foreign currency translation adjustment		0		0
Actuarial costs (reclassified to salaries, wages and benefits)	2,594	4,745	5,188	9,490
Income Tax (Expense) or Benefit	(610)	(1,080)	(1,220)	(2,120)
Other comprehensive income (loss), net of tax	1,984	3,665	3,968	7,370
Balance	(53,963)	(96,048)	(53,963)	(96,048)
Accumulated Defined Benefit Post Retirement Plans Adjustment Attributable to Parent [Member]
Balance	485	36	502	36
Foreign currency translation adjustment		0		0
Actuarial costs (reclassified to salaries, wages and benefits)	(24)	0	(47)	0
Income Tax (Expense) or Benefit	6	0	12	0
Other comprehensive income (loss), net of tax	(18)	0	(35)	0
Balance	467	36	467	36
Accumulated Foreign Currency Adjustment Attributable to Parent [Member]
Balance	0	(20)	0	(20)
Foreign currency translation adjustment		20		20
Actuarial costs (reclassified to salaries, wages and benefits)	0	0	0	0
Income Tax (Expense) or Benefit	0	0	0	0
Other comprehensive income (loss), net of tax	0	20	0	20
Balance	0	0	0	0
AOCI Attributable to Parent [Member]
Balance	(55,462)	(99,697)	(57,429)	(103,402)
Foreign currency translation adjustment		20		20
Actuarial costs (reclassified to salaries, wages and benefits)	2,570	4,745	5,141	9,490
Income Tax (Expense) or Benefit	(604)	(1,080)	(1,208)	(2,120)
Other comprehensive income (loss), net of tax	1,966	3,685	3,933	7,390
Balance	$ (53,496)	$ (96,012)	$ (53,496)	$ (96,012)