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Earnings (loss) per common share
6 Months Ended
Oct. 31, 2013
Earnings (loss) per common share [Text Block]
Note 8 Earnings (loss) per common share (“EPS”)
   
  Computation of basic and diluted EPS:

      Three Months Ended     Six Months Ended  
      October 31,     October 31,  
      2013     2012     2013     2012  
  Net income (loss) $ (2,111,228 ) $ (325,105 ) $ (3,336,519 ) $ 542,433  
  Weighted average common shares outstanding – basic and diluted (1)   42,007,439     41,592,776     41,971,160     41,159,949  
  Basic and diluted EPS $ (0.05 ) $ (0.01 ) $ (0.08 ) $ 0.01  

For the three and six months ended October 31, 2013 and October 31, 2012, common share equivalents (consisting of common shares issuable, on exercise of options, warrants and DSUs) totalling, 5,004,257 and 6,104,549, respectively, were not included in the computation of diluted EPS because the effect was anti-dilutive.

  (1)

Diluted by assumed exercise of outstanding common share equivalents using the treasury stock method.