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Note 8 - Accumulated Other Comprehensive Income (Loss) (Tables)
 6 Months Ended
Jun. 30, 2018
Notes Tables  
Reclassification out of Accumulated Other Comprehensive Income [Table Text Block]
   
Three Months Ended
June 30,
    
Six Months Ended
June 30,
  
   
2018
    
2017
    
2018
    
2017
  
Pension and other postretirement benefits:
                                
Recognized actuarial loss (a)
   $
317
     $
290
     $
611
     $
612
  
Settlement loss (b)
    
2,229
      
1,713
      
2,616
      
3,393
  
Total before income tax
   $
2,546
     $
2,003
     $
3,227
     $
4,005
  
Income tax
    
(625
)
    
(723
)
    
(796
)
    
(1,449
)
Net of income tax
   $
1,921
     $
1,280
     $
2,431
     $
2,556
  
Comprehensive Income (Loss) [Table Text Block]
   
Currency
Translation
Adjustments
    
Pension and
Other
Postretirement
Benefits
    
Accumulated
Other
Comprehensive
Income (Loss)
  
Balance at December 31, 2017
   $
(5,321
)
   $
(7,188
)
   $
(12,509
)
Reclassification adjustments
    
-
      
3,227
      
3,227
  
Current period credit
    
(1,666
)
    
-
      
(1,666
)
Income tax expense
    
-
      
(796
)
    
(796
)
Balance at June 30, 2018
   $
(6,987
)
   $
(4,757
)
   $
(11,744
)
   
Currency
Translation
Adjustments
    
Pension and
Other
Postretirement
Benefits
    
Accumulated
Other
Comprehensive
Income (Loss)
  
Balance at December 31, 2016
   $
(8,842
)
   $
(11,623
)
   $
(20,465
)
Reclassification adjustments
    
-
      
4,005
      
4,005
  
Current period credit
    
1,864
      
-
      
1,864
  
Income tax expense
    
-
      
(1,449
)
    
(1,449
)
Balance at June 30, 2017
   $
(6,978
)
   $
(9,067
)
   $
(16,045
)