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Note K - Comprehensive Income - Changes in Accumulated Other Comprehensive Loss by Component (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Sep. 30, 2023
Sep. 30, 2022
Balance $ 20,550 $ (17,711) $ 18,808 $ (24,715)
Total other comprehensive (loss) income, net of tax (56) (2,288) 3,066 (3,811)
Balance 20,504 (12,789) 20,504 (12,789)
Accumulated Defined Benefit Plans Adjustment Attributable to Parent [Member]        
Balance     (44,120) (54,394)
Other comprehensive income, net of tax, before reclassifications     0 0
Amounts reclassified from accumulated other comprehensive income, net of tax, to other, net, on the condensed consolidated statements of comprehensive income     1,645 2,307
Total other comprehensive (loss) income, net of tax     1,645 2,307
Balance (42,475) (52,087) (42,475) (52,087)
Accumulated Foreign Currency Adjustment Attributable to Parent [Member]        
Balance     (4,182) 1,066
Other comprehensive income, net of tax, before reclassifications     1,421 (6,118)
Amounts reclassified from accumulated other comprehensive income, net of tax, to other, net, on the condensed consolidated statements of comprehensive income     0 0
Total other comprehensive (loss) income, net of tax     1,421 (6,118)
Balance (2,761) (5,052) (2,761) (5,052)
AOCI Attributable to Parent [Member]        
Balance (45,180) (54,851) (48,302) (53,328)
Other comprehensive income, net of tax, before reclassifications     1,421 (6,118)
Amounts reclassified from accumulated other comprehensive income, net of tax, to other, net, on the condensed consolidated statements of comprehensive income     1,645 2,307
Total other comprehensive (loss) income, net of tax (56) (2,288) 3,066 (3,811)
Balance $ (45,236) $ (57,139) $ (45,236) $ (57,139)