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Note 7 - Accumulated Other Comprehensive Income (Loss) (Tables)
 9 Months Ended
Sep. 30, 2017
Notes Tables  
Reclassification out of Accumulated Other Comprehensive Income [Table Text Block]
   
Three
Months Ended

September
30,
    
Nine
Months Ended

September
30,
  
   
2017
    
2016
    
2017
    
2016
  
Pension and other postretirement benefits:
                                
Recognized actuarial loss (a)
   $
267
     $
351
     $
879
     $
1,053
  
Settlement loss (b)
    
305
      
-
      
2,493
      
-
  
Settlement loss (c)
    
143
      
-
      
1,348
      
-
  
Total before income tax
   $
715
     $
351
     $
4,720
     $
1,053
  
Income tax
    
(243
)
    
(123
)
    
(1,692
)
    
(343
)
Net of income tax
   $
472
     $
228
     $
3,028
     $
710
  
Schedule of Accumulated Other Comprehensive Income (Loss) [Table Text Block]
   
Currency
Translation
Adjustments
    
Pension and
Other
Postretirement
Benefits
    
Accumulated
Other
Comprehensive
Income (Loss)
  
Balance at January
1, 2017
   $
(8,842
)
   $
(11,623
)
   $
(20,465
)
Reclassification adjustments
    
-
      
4,720
      
4,720
  
Current period
credit
    
3,119
      
54
      
3,173
  
Income tax expense
    
-
      
(1,746
)
    
(1,746
)
Balance at
September 30, 2017
   $
(5,723
)
   $
(8,595
)
   $
(14,318
)
   
Currency
Translation
Adjustments
    
Pension and
Other
Postretirement
Benefits
    
Accumulated
Other
Comprehensive
Income (Loss)
  
Balance at January
1, 2016
   $
(9,057
)
   $
(13,358
)
   $
(22,415
)
Reclassification adjustments
    
-
      
1,053
      
1,053
  
Current period credit
    
1,487
      
-
      
1,487
  
Income tax expense
    
-
      
(343
)
    
(343
)
Balance at
September 30, 2016
   $
(7,570
)
   $
(12,648
)
   $
(20,218
)