Note 14 - Capital Stock - Summary of Outstanding Unvested RSUs (Details) - Restricted Stock Units (RSUs) [Member] - USD ($)	9 Months Ended
	Apr. 30, 2021	Jul. 31, 2020
Number of Restricted Stock Units (in shares)	1,615,000	1,615,000
Grant Date Fair Value (in dollars per share)	$ 0.92
Remaining Life (Year)	2 years 10 days
Aggregate Intrinsic Value	$ 4,683,500
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)	1 year 91 days
Aggregate Intrinsic Value	$ 899,000
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 76 days
Aggregate Intrinsic Value	$ 3,784,500