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Note 12 - Accumulated Other Comprehensive (Loss) Income (Tables)
 9 Months Ended
Feb. 28, 2017
Notes Tables  
Comprehensive Income (Loss) [Table Text Block]
   
Pretax
    
Tax
    
After Tax
  
Nine Months Ended February 28, 2017
  
 
 
 
  
 
 
 
  
 
 
 
Foreign exchange translation adjustments
   $
(5,694
 )    
(141
 )    
(5,553
 )
Changes in fair value of cash flow hedges
    
155
      
61
      
94
  
Accumulated other comprehensive loss
   $
(5,539
 )    
(80
 )    
(5,459
 )
                         
Twelve Months Ended May 31, 2016
  
 
 
 
  
 
 
 
  
 
 
 
Foreign exchange translation adjustments
   $
(282
 )    
(108
 )    
(174
 )
Changes in fair value of cash flow hedges
    
530
      
199
      
331
  
Accumulated other comprehensive income
   $
248
      
91
      
157
  
Schedule of Accumulated Other Comprehensive Income (Loss) [Table Text Block]
   
As of
  
   
February 28, 2017
    
May 31, 2016
  
                 
Cumulative foreign currency translation adjustments
   $
(44,866
 )    
(39,313
 )
Change in fair value of cash flow hedges, net of tax
    
-
      
(94
 )
Accumulated other comprehensive loss
   $
(44,866
 )    
(39,407
 )