Note 15 - Supplemental Cash Flow Information (Details Textual) - USD ($)	3 Months Ended	9 Months Ended
	Apr. 30, 2019	Apr. 30, 2019	Apr. 30, 2018
Stock Issued During Period, Shares, Issued for Services		165,404	208,889
Stock Issued During Period, Value, Issued for Services		$ 226,539	$ 322,865
Shares Issued, Value, Share-based Payment Arrangement, after Forfeiture, Total		$ 785,117	729,644
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		$ 1,213,333	$ 1,213,333
Stock Issued During the Period, Shares, Issued in Exchange for Warrants	750,000	750,000
Fair Value Common Shares Issued for Warrants Exchanged	$ 997,500	$ 997,500
Number of Warrants Exchanged for Common Shares	11,000,000	11,000,000
Class of Warrant or Right Cancelled, Weighted Average Exercise Price	$ 2.30	$ 2.30
Certain Management, Employees and Consultants of the Company [Member]
Shares Issued, Shares, Share-based Payment Arrangement, after Forfeiture, Total		558,875	624,408
Shares Issued, Value, Share-based Payment Arrangement, after Forfeiture, Total		$ 785,117	$ 857,258