Note K - Comprehensive Income (Loss) - Changes in Accumulated Other Comprehensive Loss by Component (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Balance	$ (53,123)	$ (49,683)
Total other comprehensive income (loss), net of tax	12,283	(2,477)
Balance	(24,715)	(53,123)
Accumulated Defined Benefit Plans Adjustment Attributable to Parent [Member]
Balance	(68,544)	(63,887)
Other comprehensive income, net of tax, before reclassifications	0	0
Amounts reclassified from accumulated other comprehensive loss, net of tax	14,150	(4,657)
Total other comprehensive income (loss), net of tax	14,150	(4,657)
Balance	(54,394)	(68,544)
Accumulated Foreign Currency Adjustment Attributable to Parent [Member]
Balance	2,933	753
Other comprehensive income, net of tax, before reclassifications	(1,867)	2,180
Amounts reclassified from accumulated other comprehensive loss, net of tax	0	0
Total other comprehensive income (loss), net of tax	(1,867)	2,180
Balance	1,066	2,933
AOCI Attributable to Parent [Member]
Balance	(65,611)	(63,134)
Other comprehensive income, net of tax, before reclassifications	(1,867)	2,180
Amounts reclassified from accumulated other comprehensive loss, net of tax	14,150	(4,657)
Total other comprehensive income (loss), net of tax	12,283	(2,477)
Balance	$ (53,328)	$ (65,611)