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Earnings (loss) per common share (EPS)
9 Months Ended
Jan. 31, 2015
Earnings (loss) per common share (EPS) [Text Block]
Note 8 Earnings (loss) per common share (“EPS”)

Computation of basic and diluted EPS:

      Three Months Ended     Nine Months Ended  
      January 31,     January 31,  
      2015     2014     2015     2014  
  Net loss $ (525,083 ) $ (2,220,808 ) $ (3,027,240 ) $ (5,557,327 )
  Weighted average common                        
  shares outstanding – basic and                        
  diluted   42,482,355     42,174,448     42,542,594     42,038,923  
  Basic and diluted EPS $ (0.01 ) $ (0.05 ) $ (0.07 ) $ (0.13 )

As at January 31, 2015 and January 31, 2014, common share equivalents, consisting of common shares issuable, on exercise of options, warrants and DSUs of 5,759,630 and 4,834,230, respectively, were not included in the computation of diluted EPS because the effect was anti-dilutive.