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Note 8 - Accumulated Other Comprehensive Income (Loss) (Tables)
 6 Months Ended
Jun. 30, 2019
Notes Tables  
Reclassification out of Accumulated Other Comprehensive Income [Table Text Block]
   
Three Months Ended
June 30,
    
Six Months Ended
June 30,
  
   
2019
    
2018
    
2019
    
2018
  
Pension and other postretirement benefits:
                                
Recognized actuarial loss (a)
   $
479
     $
317
     $
877
     $
611
  
Settlement loss (b)
    
-
      
2,229
      
-
      
2,616
  
Total before income tax
   $
479
     $
2,546
     $
877
     $
3,227
  
Income tax
    
(101
)
    
(625
)
    
(183
)
    
(796
)
Net of income tax
   $
378
     $
1,921
     $
694
     $
2,431
  
Comprehensive Income (Loss) [Table Text Block]
   
Currency
Translation
Adjustments
    
Pension and
Other
Postretirement
Benefits
    
Accumulated
Other
Comprehensive
Income (Loss)
  
Balance at December 31, 2018
   $
(8,243
)
   $
(15,180
)
   $
(23,423
)
Reclassification adjustments
    
-
      
877
      
877
  
Current period benefit
    
431
      
-
      
431
  
Income tax benefit (charge)
    
-
      
(183
)
    
(183
)
Balance at June 30, 2019
   $
(7,812
)
   $
(14,486
)
   $
(22,298
)
   
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 benefit
    
(1,666
)
    
-
      
(1,666
)
Income tax charge
    
-
      
(796
)
    
(796
)
Balance at June 30, 2018
   $
(6,987
)
   $
(4,757
)
   $
(11,744
)