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Note 6 - Accumulated Other Comprehensive Loss (Tables)
 3 Months Ended
Mar. 31, 2018
Notes Tables  
Schedule of Accumulated Other Comprehensive Income (Loss) [Table Text Block]
   
Foreign
Currency
Translation
Adjustments
    
Defined
Benefit
Pension Plan
    
Unrealized
Gain (Loss)
on Cash Flow
Hedges
    
Total
  
                                 
Beginning Balance – January 1, 2018
   $
(12,856
 )   $
(10,978
 )   $
2,636
 
   $
(21,198
 )
Other comprehensive income before reclassifications
    
6,179
      
-
      
6,647
(1)
    
12,826
  
Amounts reclassified from AOCL
    
-
      
-
      
-
 
    
-
  
Net current-period other comprehensive income
    
6,179
      
-
      
6,647
 
    
12,826
  
Ending Balance – March 31, 2018
   $
(6,677
 )   $
(10,978
 )   $
9,283
 
   $
(8,372
 )
   
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 before reclassifications
    
3,600
      
-
      
440
(2)
    
4,040
  
Amounts reclassified from AOCL
    
-
      
-
      
-
 
    
-
  
Net current-period other comprehensive income
    
3,600
      
-
      
440
 
    
4,040
  
Ending Balance – March 31, 2017
   $
(24,447
 )   $
(11,040
 )   $
(636
)
   $
(36,123
 )