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Note K - Comprehensive Income (Loss) - Changes in Accumulated Other Comprehensive Loss By Component (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2021
Mar. 31, 2021
Jun. 30, 2020
Mar. 31, 2020
Jun. 30, 2021
Jun. 30, 2020
Balance $ (54,423) $ (53,123) $ (44,291) $ (49,683) $ (53,123) $ (49,683)
Total other comprehensive income, net of tax 856 278 1,105 51 1,134 1,156
Balance (42,559) (54,423) (49,340) (44,291) (42,559) (49,340)
Accumulated Defined Benefit Plans Adjustment Attributable to Parent [Member]            
Balance   (68,544)   (63,887) (68,544) (63,887)
Other comprehensive income (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 loss         1,596 1,218
Total other comprehensive income, net of tax         1,596 1,218
Balance (66,948)   (62,669)   (66,948) (62,669)
Accumulated Foreign Currency Adjustment Attributable to Parent [Member]            
Balance   2,933   753 2,933 753
Other comprehensive income (loss), net of tax, before reclassifications         (462) (62)
Amounts reclassified from accumulated other comprehensive income (loss), net of tax, to other, net, on the condensed consolidated statements of comprehensive loss         0 0
Total other comprehensive income, net of tax         (462) (62)
Balance 2,471   691   2,471 691
AOCI Attributable to Parent [Member]            
Balance (65,333) (65,611) (63,083) (63,134) (65,611) (63,134)
Other comprehensive income (loss), net of tax, before reclassifications         (462) (62)
Amounts reclassified from accumulated other comprehensive income (loss), net of tax, to other, net, on the condensed consolidated statements of comprehensive loss         1,596 1,218
Total other comprehensive income, net of tax 856 278 1,105 51 1,134 1,156
Balance $ (64,477) $ (65,333) $ (61,978) $ (63,083) $ (64,477) $ (61,978)