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Note 12 - Comprehensive Loss (Tables)
6 Months Ended
Nov. 30, 2012
Schedule of Accumulated Other Comprehensive Income (Loss) [Table Text Block]
   
November 30, 2012
   
May 31, 2012
 
             
Foreign currency translation adjustment
  $ (12,343 )   $ (18,385 )
Cash flow hedge, net of tax
    (1,712 )     (1,358 )
Accumulated other comprehensive loss
  $ (14,055 )   $ (19,743 )