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Note 5 - Accumulated Other Comprehensive Loss (Tables)
 12 Months Ended
Dec. 31, 2016
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, 2016
   $
(9,502
 )   $
(11,362
 )   $
(1,611
 )   $
(22,475
 )
Other comprehensive income (loss) before reclassifications
    
(18,545
 )    
(273
 )    
535
      
(18,283
 )
Amounts reclassified from AOCL
    
-
      
595
      
-
      
595
  
Net current-period other comprehensive income (loss)
    
(18,545
 )    
322
      
535
      
(17,688
 )
Ending Balance
– December 31, 2016
   $
(28,047
 )   $
(11,040
 )   $
(1,076
 )   $
(40,163
 )
   
Foreign
Currency
Translation
Adjustments
    
Defined
Benefit
Pension Plan
    
Unrealized
Loss on Cash
Flow Hedges
    
Total
  
                                 
Beginning Balance
– January 1, 2015
   $
(1,878
 )   $
(13,243
 )   $
(646
 )   $
(15,767
 )
Other comprehensive income (loss) before reclassifications
    
(7,624
 )    
1,105
      
(965
 )    
(7,484
 )
Amounts reclassified from AOCL
    
-
      
776
      
-
      
776
  
Net current-period other comprehensive income (loss)
    
(7,624
 )    
1,881
      
(965
 )    
(6,708
 )
Ending Balance
– December 31, 2015
   $
(9,502
 )   $
(11,362
 )   $
(1,611
 )   $
(22,475
 )