Consolidated Balance Sheets (Parentheticals) - $ / shares	Jul. 31, 2018	Jul. 31, 2017
Statement of Financial Position [Abstract]
Preferred stock par value (in dollars per share)	$ 0.0001	$ 0.0001
Preferred stock, shares authorized	5,000,000	5,000,000
Preferred stock, shares issued	0	0
Common stock par value (in dollars per share)	$ 0.0001	$ 0.0001
Common stock, shares authorized	400,000,000	400,000,000
Common stock, shares issued	233,898,841	230,488,296
Common stock, shares outstanding	233,898,841	230,488,296