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Note 5 - Accumulated Other Comprehensive Loss (Tables)
 12 Months Ended
Dec. 31, 2018
Notes Tables  
Schedule of Accumulated Other Comprehensive Income (Loss) [Table Text Block]
   
Foreign
Currency
Translation
Adjustments
    
Defined
Benefit
Pension Plan
      
Unrealized
Gain on Cash
Flow Hedges
      
Total
  
                                     
Beginning Balance – January 1, 2018
   $
(12,856
 )   $
(10,978
 )
 
   $
2,636
  
 
   $
(21,198
 )
Other comprehensive income (loss) before reclassifications
    
(5,976
 )    
(156
 )
(1)
    
2,924
  
(2)
    
(3,208
 )
Amounts reclassified from AOCL
    
-
      
593
  
(3)
    
-
  
 
    
593
  
Net current-period other comprehensive income (loss)
    
(5,976
 )    
437
  
 
    
2,924
  
 
    
(2,615
 )
Ending Balance – December 31, 2018
   $
(18,832
 )   $
(10,541
 )
 
   $
5,560
  
 
   $
(23,813
 )
   
Foreign
Currency
Translation
Adjustments
    
Defined
Benefit
Pension Plan
  
 
  
Unrealized
Gain (Loss) on
Cash Flow
Hedges
  
 
  
Total
  
                                     
Beginning Balance – January 1, 2017
   $
(28,047
 )   $
(11,040
 )
 
   $
(1,076
 )
 
   $
(40,163
 )
Other comprehensive income (loss) before reclassifications
    
15,191
      
(591
 )
(4)
    
3,712
  
(5)
    
18,312
  
Amounts reclassified from AOCL
    
-
      
653
  
(6)
    
-
  
 
    
653
  
Net current-period other comprehensive income
    
15,191
      
62
  
 
    
3,712
  
 
    
18,965
  
Ending Balance – December 31, 2017
   $
(12,856
 )   $
(10,978
 )
 
   $
2,636
  
 
   $
(21,198
 )