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Note 8 - Accumulated Other Comprehensive Income (Loss) (Tables)
 3 Months Ended
Mar. 31, 2020
Notes Tables  
Reclassification out of Accumulated Other Comprehensive Income [Table Text Block]
   
Three Months Ended
March 31,
  
   
2020
    
2019
  
Pension and other postretirement benefits:
                
Recognized actuarial loss (a)
   $
590
     $
398
  
Settlement loss (a)
    
1,478
      
-
  
Total before income tax
   $
2,068
     $
398
  
Income tax
    
(489
)
    
(82
)
Net of income tax
   $
1,579
     $
316
  
Comprehensive Income (Loss) [Table Text Block]
   
Currency
Translation
Adjustments
    
Pension and
Other
Postretirement
Benefits
    
Accumulated
Other
Comprehensive
Income (Loss)
  
Balance at December 31, 2019
   $
(8,155
)
   $
(20,382
)
   $
(28,537
)
Reclassification adjustments
    
-
      
2,068
      
2,068
  
Current period charge
    
(2,361
)
    
-
      
(2,361
)
Income tax benefit (charge)
    
-
      
(489
)
    
(489
)
Balance at March 31, 2020
   $
(10,516
)
   $
(18,803
)
   $
(29,319
)
   
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
    
-
      
398
      
398
  
Current period charge
    
(185
)
    
-
      
(185
)
Income tax benefit (charge)
    
33
      
(82
)
    
(49
)
Balance at March 31, 2019
   $
(8,395
)
   $
(14,864
)
   $
(23,259
)