Note 13 - Capital Stock - Summary of Outstanding Unvested RSUs (Details) - Restricted Stock Units (RSUs) [Member] - USD ($)	9 Months Ended
	Apr. 30, 2022	Jul. 31, 2021
Number of Restricted Stock Units (in shares)	997,612	997,612
Grant Date Fair Value (in dollars per share)	$ 1.42
Remaining Life (Year)	1 year 5 months 23 days
Aggregate Intrinsic Value	$ 4,239,851
July 30, 2019 [Member]
Number of Restricted Stock Units (in shares)	154,999
Grant Date Fair Value (in dollars per share)	$ 0.94
Remaining Life (Year)	3 months
Aggregate Intrinsic Value	$ 658,746
July 16, 2020 [Member]
Number of Restricted Stock Units (in shares)	434,996
Grant Date Fair Value (in dollars per share)	$ 0.91
Remaining Life (Year)	1 year 2 months 15 days
Aggregate Intrinsic Value	$ 1,848,733
July 21, 2021 [Member]
Number of Restricted Stock Units (in shares)	407,617
Grant Date Fair Value (in dollars per share)	$ 2.15
Remaining Life (Year)	2 years 2 months 23 days
Aggregate Intrinsic Value	$ 1,732,372