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Significant Accounting Policies (Tables)
6 Months Ended
Oct. 31, 2012
Schedule of Acquired Finite-Lived Intangible Assets by Major Class [Table Text Block]
                  Accumulated        
            Accumulated     Impairment     Net Carrying  
      Cost     Amortization     Charge     Amount  
  Acquired technologies $   6,306,336   $   4,417,678   $   1,888,658   $  –  
  Customer assets   2,727,648     1,492,195     1,216,028     19,425  
  Intangible assets $   9,033,984   $   5,909,873   $   3,104,686   $   19,425