Note K - Comprehensive Income (Loss) - Changes in Accumulated Other Comprehensive Loss by Component (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021
Balance	$ (24,715)	$ (53,123)
Total other comprehensive income, net of tax	5,026	12,283
Balance	18,808	(24,715)
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 loss, net of tax	10,274	14,150
Total other comprehensive income, net of tax	10,274	14,150
Balance	(44,120)	(54,394)
Accumulated Foreign Currency Adjustment Attributable to Parent [Member]
Balance	1,066	2,933
Other comprehensive loss, net of tax, before reclassifications	(5,248)	(1,867)
Amounts reclassified from accumulated other comprehensive loss, net of tax		0
Total other comprehensive income, net of tax	(5,248)	(1,867)
Balance	(4,182)	1,066
AOCI Attributable to Parent [Member]
Balance	(53,328)	(65,611)
Other comprehensive loss, net of tax, before reclassifications	(5,248)	(1,867)
Amounts reclassified from accumulated other comprehensive loss, net of tax	10,274	14,150
Total other comprehensive income, net of tax	5,026	12,283
Balance	$ (48,302)	$ (53,328)