Note 13 - Capital Stock - Warrants Outstanding and Exercisable (Details) - $ / shares	3 Months Ended
	Oct. 31, 2022	Jul. 31, 2022
Weighted Average Exercise Price (in dollars per share)	$ 2.85	$ 1.92
Number of Warrants Outstanding (in shares)	4,837,586	3,615,454
Weighted Average Remaining Contractual Life (Year)	1 year 7 months 24 days
Warrants 1 [Member]
Weighted Average Exercise Price (in dollars per share)	$ 1.71
Number of Warrants Outstanding (in shares)	144,194
Weighted Average Remaining Contractual Life (Year)	6 months 18 days
Expiry Date	May 20, 2023
Warrants 2 [Member]
Weighted Average Exercise Price (in dollars per share)	$ 1.64
Number of Warrants Outstanding (in shares)	25,000
Weighted Average Remaining Contractual Life (Year)	6 months 18 days
Expiry Date	May 21, 2023
Warrants 3 [Member]
Weighted Average Exercise Price (in dollars per share)	$ 1.43
Number of Warrants Outstanding (in shares)	811,362
Weighted Average Remaining Contractual Life (Year)	7 months 2 days
Expiry Date	Jun. 02, 2023
Warrants 4 [Member]
Weighted Average Exercise Price (in dollars per share)	$ 3.15
Number of Warrants Outstanding (in shares)	3,675,212
Weighted Average Remaining Contractual Life (Year)	1 year 10 months 6 days
Expiry Date	Sep. 07, 2024
Warrants 5 [Member]
Weighted Average Exercise Price (in dollars per share)	$ 4.13
Number of Warrants Outstanding (in shares)	181,818
Weighted Average Remaining Contractual Life (Year)	3 years 5 months 4 days
Expiry Date	Apr. 05, 2026