Note 15 - Supplemental Cash Flow Information (Details Textual) - USD ($)	6 Months Ended
	Jan. 31, 2019	Jan. 31, 2018
Stock Issued During Period, Shares, Issued for Services	129,706	180,378
Stock Issued During Period, Value, Issued for Services	$ 178,454	$ 284,306
Stock Issued During Period, Shares, Share-based Compensation, Net of Forfeitures, Total	364,702	451,101
Stock Issued During Period, Value, Share-based Compensation, Net of Forfeitures, Total	$ 529,492	$ 616,468
Stock Issued, Shares Issued For Extension Fees	1,180,328
Stock Issued Value Issued For Extension Fees	$ 1,400,000
Interest Paid, Excluding Capitalized Interest, Operating Activities	$ 817,778	$ 817,778