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Significant Accounting Policies (Tables)
9 Months Ended
Jan. 31, 2016
Accounting Policies [Abstract]  
Dilutive Effect of Convertible Securities Outstanding
  January 31, 2016   January 31, 2015
Stock options   3,083,667      3,597,000
Warrants   5,855,400      1,614,400
  TOTAL POSSIBLE DILUTION   8,939,067      5,211,400