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Note 8 - Accumulated Other Comprehensive Income (Loss) (Tables)
 9 Months Ended
Sep. 30, 2018
Notes Tables  
Reclassification out of Accumulated Other Comprehensive Income [Table Text Block]
   
Three Months Ended
September 30,
    
Nine Months Ended
September 30,
  
   
2018
    
2017
    
2018
    
2017
  
Pension and other postretirement benefits:
                                
Recognized actuarial loss (a)
   $
285
     $
267
     $
896
     $
879
  
Settlement loss (b)
    
120
      
448
      
2,736
      
3,841
  
Total before income tax
   $
405
     $
715
     $
3,632
     $
4,720
  
Income tax
    
(97
)
    
(243
)
    
(893
)
    
(1,692
)
Net of income tax
   $
308
     $
472
     $
2,739
     $
3,028
  
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
    
-
      
3,632
      
3,632
  
Current period charge
    
(1,549
)
    
-
      
(1,549
)
Income tax expense
    
-
      
(893
)
    
(893
)
Balance at September 30, 2018
   $
(6,870
)
   $
(4,449
)
   $
(11,319
)
   
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
    
-
      
4,720
      
4,720
  
Current period benefit
    
3,119
      
54
      
3,173
  
Income tax expense
    
-
      
(1,746
)
    
(1,746
)
Balance at September 30, 2017
   $
(5,723
)
   $
(8,595
)
   $
(14,318
)