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Note 5 - Accumulated Other Comprehensive Loss (Tables)
 12 Months Ended
Dec. 31, 2017
Notes Tables  
Reclassification out of Accumulated Other Comprehensive Income [Table Text Block]
Pension and other postretirement benefits:
  
201
7
    
201
6
    
201
5
  
Recognized actuarial loss (a)
   $
1,093
     $
1,402
     $
1,581
  
Settlement loss (b)
    
2,628
      
-
      
2,584
  
Settlement loss (c)
    
1,403
      
-
      
1,199
  
Total before income tax
    
5,124
      
1,402
      
5,364
  
Income tax
    
(1,670
 )    
(446
 )    
(1,749
 )
Net of income tax
   $
3,454
     $
956
     $
3,615
  
Comprehensive Income (Loss) [Table Text Block]
   
Currency Translation Adjustments
    
Pension and OPEB Adjustments
    
Accumulated Other Comprehensive (Loss) Income
  
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
 )
Reclassification 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
 )
Reclassification adjustments
    
 
      
5,124
      
5,124
  
Current period benefit
    
3,521
      
1,479
      
5,000
  
Income tax charge
    
 
      
(2,168
 )    
(2,168
 )
Balance at December
31, 2017
   $
(5,321
 )   $
(7,188
 )   $
(12,509
 )