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Note 11 - Comprehensive Loss (Tables)
3 Months Ended
Aug. 31, 2012
Schedule of Accumulated Other Comprehensive Income (Loss) [Table Text Block]
   
August 31, 2012
   
May 31, 2012
 
             
Foreign currency translation adjustment
  $ (14,890 )   $ (18,385 )
Cash flow hedge, net of tax
    (1,611 )     (1,358 )
Accumulated other comprehensive loss
  $ (16,501 )   $ (19,743 )