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Note K - Comprehensive Loss (Tables)
 12 Months Ended
Dec. 31, 2020
Notes Tables  
Schedule of Accumulated Other Comprehensive Income (Loss) [Table Text Block]
   
Defined Benefit
  
Foreign
    
 
 
In thousands
  
Pension Items
  
Currency Items
  
Total
Balance at December 31, 2018
   $
(46,584
 )   $
101
   $
(46,483
 )
Other comprehensive income, net of tax, before reclassifications
  
—
  
652
  
652
Amounts reclassified from accumulated other comprehensive loss, net of tax
  
(5,948
 )  
—
  
(5,948
 )
Adoption of ASU 2018-2  
(11,355
 )  
—
  
(11,355
 )
Net current period other comprehensive loss, net of tax
  
(17,303
 )  
652
  
(16,651
 )
Balance at December 31, 2019
   $
(63,887
 )   $
753
   $
(63,134
 )
Other comprehensive income, net of tax, before reclassifications
  
—
  
2,180
  
2,180
Amounts reclassified from accumulated other comprehensive loss, net of tax
  
(4,657
 )  
—
  
(4,657
 )
Net current period other comprehensive loss, net of tax
  
(4,657
 )  
2,180
  
(2,477
 )
Balance at December 31, 2020
   $
(68,544
 )   $
2,933
   $
(65,611
 )