Derivative Liabilities - Derivative warrant liability (Details) - USD ($)	6 Months Ended
	Jan. 31, 2017	Jul. 31, 2016
Notes to Financial Statements
Balance - Derivative warrant liability Value	$ 2,567,328	$ 2,048,846
Forfeited or expired, value	$ (240,906)
Forfeited or expired, no. of warrants	(54,545)
Warrants exercised	(3,333)
Increase (Decrease) in fair value of derivative warrant liability	$ 759,388
No. of Warrants - Derivative warrant liability	326,000	383,878