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Note E - Accumulated Other Comprehensive Loss (Tables)
 12 Months Ended
Dec. 31, 2016
Notes Tables  
Reclassification out of Accumulated Other Comprehensive Income [Table Text Block]
   
2016
    
2015
    
2014
  
Pension and other postretirement benefits:                        
Recognized actuarial loss (a)
   $
1,402
     $
1,581
     $
483
  
Settlement loss (b)
    
-
      
2,584
      
-
  
Settlement loss (c)
    
-
      
1,199
      
-
  
Total before income tax
    
1,402
      
5,364
      
483
  
Income tax
    
(446
 )    
(1,749
 )    
(177
 )
Net of income tax
   $
956
      
3,615
     $
306
  
Comprehensive Income (Loss) [Table Text Block]
   
Currency
Translation
Adjustments
    
Pension and
OPEB
Adjustments
    
Accumulated
Other
Comprehensive
(Loss) Income
  
Balance at January 1, 2014
   $
(1,062
 )   $
(7,399
 )   $
(8,461
 )
Reclassifications adjustments
    
-
      
483
      
483
  
Current period charge
    
(3,276
 )    
(9,294
 )    
(12,570
 )
Income tax benefit
    
-
      
3,222
      
3,222
  
Balance at December 31, 2014
    
(4,338
 )    
(12,988
 )    
(17,326
 )
Reclassification adjustments
    
-
      
5,364
      
5,364
  
Current period charge
    
(4,719
 )    
(6,038
 )    
(10,757
 )
Income tax benefit
    
-
      
304
      
304
  
Balance at December 31, 2015
    
(9,057
 )    
(13,358
 )    
(22,415
 )
Reclassifications adjustments
    
-
      
1,402
      
1,402
  
Current period benefit
    
215
      
1,357
      
1,572
  
Income tax charge
    
-
      
(1,024
 )    
(1,024
 )
Balance at December 31, 2016
   $
(8,842
 )   $
(11,623
 )   $
(20,465
 )