Note K - Comprehensive Income (Loss) - Changes in Accumulated Other Comprehensive Loss by Component (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Balance	$ (24,715)	$ (53,123)
Total other comprehensive income, net of tax	506	278
Balance	(20,571)	(54,423)
Accumulated Defined Benefit Plans Adjustment Attributable to Parent [Member]
Balance	(54,394)	(68,544)
Other comprehensive loss, net of tax, before reclassifications	0	0
Amounts reclassified from accumulated other comprehensive income (loss), net of tax, to other, net, on the condensed consolidated statements of comprehensive income (loss)	1,010	736
Total other comprehensive income, net of tax	1,010	736
Balance	(53,384)	(67,808)
Accumulated Foreign Currency Adjustment Attributable to Parent [Member]
Balance	1,066	2,933
Other comprehensive loss, net of tax, before reclassifications	(504)	(458)
Amounts reclassified from accumulated other comprehensive income (loss), net of tax, to other, net, on the condensed consolidated statements of comprehensive income (loss)	0	0
Total other comprehensive income, net of tax	(504)	(458)
Balance	562	2,475
AOCI Attributable to Parent [Member]
Balance	(53,328)	(65,611)
Other comprehensive loss, net of tax, before reclassifications	(504)	(458)
Amounts reclassified from accumulated other comprehensive income (loss), net of tax, to other, net, on the condensed consolidated statements of comprehensive income (loss)	1,010	736
Total other comprehensive income, net of tax	506	278
Balance	$ (52,822)	$ (65,333)