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Note 7 - Accumulated Other Comprehensive Loss (Tables)
 12 Months Ended
Dec. 31, 2019
Notes Tables  
Reclassification out of Accumulated Other Comprehensive Income [Table Text Block]
Pension and other postretirement benefits:
  
201
9
    
201
8
    
201
7
  
Recognized actuarial loss (a)
   $
1,753
     $
1,164
     $
1,093
  
Settlement loss (b)
    
-
      
2,852
      
4,031
  
Total before income tax
    
1,753
      
4,016
      
5,124
  
Income tax
    
(363
 )    
(823
 )    
(1,670
 )
Net of income tax
   $
1,390
     $
3,193
     $
3,454
  
Comprehensive Income (Loss) [Table Text Block]
   
Currency
Translation
Adjustments
    
Pension and
OPEB
Adjustments
    
Accumulated
Other
Comprehensive
(Loss) Income
  
Balance at December 31, 2016
   $
(8,842
 )   $
(11,623
 )   $
(20,465
 )
Reclassification adjustments
    
-
      
5,124
      
5,124
  
Current period benefit
    
3,521
      
1,479
      
5,000
  
Income tax charge
    
-
      
(2,168
 )    
(2,168
 )
Balance at December 31, 2017
    
(5,321
 )    
(7,188
 )    
(12,509
 )
Reclassification of stranded income tax effects in accumulated other comprehensive income
    
-
      
(2,070
 )    
(2,070
 )
Reclassification adjustments
    
-
      
4,016
      
4,016
  
Current period charge
    
(2,922
 )    
(9,644
 )    
(12,566
 )
Income tax charge
    
-
      
(294
 )    
(294
 )
Balance at December 31, 201
8
    
(8,243
 )    
(15,180
 )    
(23,423
 )
Reclassification adjustments
    
-
      
1,753
      
1,753
  
Current period benefit (charge)
    
88
      
(8,521
 )    
(8,433
 )
Income tax benefit
    
-
      
1,566
      
1,566
  
Balance at December 31, 201
9
   $
(8,155
 )   $
(20,382
 )   $
(28,537
 )