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Note 5 - Accumulated Other Comprehensive Loss (Tables)
 9 Months Ended
Sep. 30, 2017
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
– July 1, 2017
   $
(15,857
 )   $
(11,040
 )   $
(312
 )
 
   $
(27,209
 )
Other comprehensive income before reclassifications
    
3,826
      
-
      
581
  
(1)
    
4,407
  
Amounts reclassified from AOCL
    
-
      
-
      
-
  
 
    
-
  
Net current-period other comprehensive income
    
3,826
      
-
      
581
  
 
    
4,407
  
Ending Balance
– September 30, 2017
   $
(12,031
 )   $
(11,040
 )   $
269
  
 
   $
(22,802
 )
   
Foreign
Currency Translation Adjustments
    
Defined
Benefit
Pension Plan
    
Unrealized
Gain (Loss) on Cash Flow
Hedges
      
Total
  
                                   
Beginning Balance
– July 1, 2016
   $
(20,234
 )   $
(11,362
 )   $
(2,899
 )
 
   $
(34,495
 )
Other comprehensive income (loss) before reclassifications
    
(315
 )    
-
      
779
  
(2)
    
464
  
Amounts reclassified from AOCL
    
-
      
-
      
-
  
 
    
-
  
Net current-period other comprehensive income (loss)
    
(315
 )    
-
      
779
  
 
    
464
  
Ending Balance
– September 30, 2016
   $
(20,549
 )   $
(11,362
 )   $
(2,120
 )
 
   $
(34,031
 )
   
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
    
16,016
      
-
      
1,345
  
(3)
    
17,361
  
Amounts reclassified from AOCL
    
-
      
-
      
-
  
 
    
-
  
Net current-period other comprehensive income
    
16,016
      
-
      
1,345
  
 
    
17,361
  
Ending Balance
– September 30, 2017
   $
(12,031
 )   $
(11,040
 )   $
269
  
 
   $
(22,802
 )
   
Foreign
Currency Translation Adjustments
    
Defined
Benefit
Pension Plan
    
Unrealized
Loss on
Cash Flow
Hedges
      
Total
  
                                   
Beginning Balance
– January 1, 2016
   $
(9,502
 )   $
(11,362
 )   $
(1,611
 )
 
   $
(22,475
 )
Other comprehensive loss before reclassifications
    
(11,047
 )    
-
      
(509
 )
(4)
    
(11,556
 )
Amounts reclassified from AOCL
    
-
      
-
      
-
  
 
    
-
  
Net current-period other comprehensive loss
    
(11,047
 )    
-
      
(509
 )
 
    
(11,556
 )
Ending Balance
– September 30, 2016
   $
(20,549
 )   $
(11,362
 )   $
(2,120
 )
 
   $
(34,031
 )