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Note K - Comprehensive Loss - Changes in Accumulated Other Comprehensive Loss By Component (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Balance	$ (49,683)	$ (19,184)
Adoption of ASU 2018-02+A19		(11,355)
Total other comprehensive loss, net of tax	(2,477)	(16,651)
Balance	(53,123)	(49,683)
Accumulated Defined Benefit Plans Adjustment Attributable to Parent [Member]
Balance	(63,887)	(46,584)
Other comprehensive income, net of tax, before reclassifications
Amounts reclassified from accumulated other comprehensive loss, net of tax	(4,657)	(5,948)
Adoption of ASU 2018-02+A19		(11,355)
Total other comprehensive loss, net of tax	(4,657)	(17,303)
Balance	(68,544)	(63,887)
Accumulated Foreign Currency Adjustment Attributable to Parent [Member]
Balance	753	101
Other comprehensive income, net of tax, before reclassifications	2,180	652
Amounts reclassified from accumulated other comprehensive loss, net of tax
Adoption of ASU 2018-02+A19
Total other comprehensive loss, net of tax	2,180	652
Balance	2,933	753
AOCI Attributable to Parent [Member]
Balance	(63,134)	(46,483)
Other comprehensive income, net of tax, before reclassifications	2,180	652
Amounts reclassified from accumulated other comprehensive loss, net of tax	(4,657)	(5,948)
Adoption of ASU 2018-02+A19		(11,355)
Total other comprehensive loss, net of tax	(2,477)	(16,651)
Balance	$ (65,611)	$ (63,134)

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