Note 13 - Capital Stock - Summary of Outstanding Unvested RSUs (Details) - Restricted Stock Units (RSUs) [Member] - USD ($)	12 Months Ended
	Jul. 31, 2020	Jul. 31, 2019	Jul. 31, 2018
Number of Restricted Stock Units (in shares)	1,615,000	465,000
Grant Date Fair Value (in dollars per share)	$ 0.92	$ 0.94
Remaining Life (Year)	2 years 281 days
Aggregate Intrinsic Value	$ 86,949
July 30, 2019 [Member]
Number of Restricted Stock Units (in shares)	310,000
Grant Date Fair Value (in dollars per share)	$ 0.94
Remaining Life (Year)	2 years
Aggregate Intrinsic Value	$ 8,649
July 16, 2020 [Member]
Number of Restricted Stock Units (in shares)	1,305,000
Grant Date Fair Value (in dollars per share)	$ 0.91
Remaining Life (Year)	2 years 350 days
Aggregate Intrinsic Value	$ 78,300