Derivative Liabilities - Derivative warrant liability (Details) - USD ($)	12 Months Ended
	Jul. 31, 2017	Jul. 31, 2016
Notes to Financial Statements
Balance - Derivative warrant liability Value	$ 2,048,846	$ 2,363,415
No. of Warrants - Derivative warrant liability	383,878	512,911
Forfeited or expired, value	$ (240,906)	$ (455,573)
Forfeited or expired, no. of warrants	(65,896)	(129,033)
Warrants exercised, value	$ (1,532,336)
Warrants exercised	(317,982)
Decrease in fair value of derivative warrant liability	$ (275,604)	$ 141,004
Balance - Derivative warrant liability Value		$ 2,048,846
No. of Warrants - Derivative warrant liability		383,878