Schedule of stock option granted during the year (Details)	9 Months Ended	12 Months Ended
Apr. 30, 2017	Apr. 30, 2016	Jul. 31, 2016
Risk-free interest rate	0.76%	0.43%	0.64%
Expected life of options			5 years
Expected annualized volatility	179.41%	215.30%	151.50%
Warrant [Member]
Expected life of options	2 years	2 years

Period the instrument, asset or liability is expected to be outstanding, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (bbb)
-URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19207-110258

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- Definition

Measure of dispersion, in percentage terms (for instance, the standard deviation or variance), for a given stock price.

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- Definition

Risk-free interest rate assumption used in valuing an instrument.

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