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Note 8 - Accumulated Other Comprehensive Income (Loss) (Tables)
 3 Months Ended
Mar. 31, 2018
Notes Tables  
Reclassification out of Accumulated Other Comprehensive Income [Table Text Block]
   
Three Months Ended
March 31,
  
   
2018
    
2017
 
Pension and other postretirement benefits:
                
Recognized actuarial loss (a)
   $
294
     $
322
  
Settlement loss (b)
    
387
      
1,680
  
Total before income tax
   $
681
     $
2,002
  
Income tax
    
(171
)
    
(726
)
Net of income tax
   $
510
     $
1,276
  
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
    
-
      
681
      
681
  
Current period credit
    
189
      
-
      
189
  
Income tax expense
    
-
      
(171
)
    
(171
)
Balance at March 31, 2018
   $
(5,132
)
   $
(6,678
)
   $
(11,810
)
   
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
    
-
      
2,002
      
2,002
  
Current period credit
    
547
      
14
      
561
  
Income tax expense
    
-
      
(740
)
    
(740
)
Balance at March 31, 2017
   $
(8,295
)
   $
(10,347
)
   $
(18,642
)