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Note 8 - Accumulated Other Comprehensive Income (Loss) (Tables)
 9 Months Ended
Sep. 30, 2019
Notes Tables  
Reclassification out of Accumulated Other Comprehensive Income [Table Text Block]
   
Three Months Ended

Septem
b
er
30,
    
Nine Months Ended
September 30,
  
   
2019
    
2018
    
2019
    
2018
  
Pension and other postretirement benefits:
                                
Recognized actuarial loss (a)
   $
438
     $
285
     $
1,315
     $
896
  
Settlement loss (b)
    
-
      
120
      
-
      
2,736
  
Total before income tax
   $
438
     $
405
     $
1,315
     $
3,632
  
Income tax
    
(98
)
    
(97
)
    
(281
)
    
(893
)
Net of income tax
   $
340
     $
308
     $
1,034
     $
2,739
  
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
    
-
      
1,315
      
1,315
  
Current period benefit
    
(1,180
)
    
-
      
(1,180
)
Income tax benefit (charge)
    
-
      
(281
)
    
(281
)
Balance at September 30, 2019
   $
(9,423
)
   $
(14,146
)
   $
(23,569
)
   
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 benefit
    
(1,549
)
    
-
      
(1,549
)
Income tax charge
    
-
      
(893
)
    
(893
)
Balance at September 30, 2018
   $
(6,870
)
   $
(4,449
)
   $
(11,319
)