Note 13 - Capital Stock - Warrants Outstanding and Exercisable (Details) - $ / shares	9 Months Ended
	Apr. 30, 2022	Jan. 31, 2022	Oct. 31, 2021	Jul. 31, 2021
Weighted Average Exercise Price (in dollars per share)	$ 1.91	$ 1.90	$ 1.91	$ 1.90
Number of Warrants Outstanding (in shares)	3,982,779	4,322,624	4,895,474	5,387,323
Warrants 1 [Member]
Weighted Average Exercise Price (in dollars per share)
Number of Warrants Outstanding (in shares)	3,775,961
Weighted Average Remaining Contractual Life (Year)	4 months 24 days
Expiry Date	Sep. 23, 2022
Warrants 2 [Member]
Weighted Average Exercise Price (in dollars per share)
Number of Warrants Outstanding (in shares)	25,000
Weighted Average Remaining Contractual Life (Year)	1 year 21 days
Expiry Date	May 21, 2023
Warrants 3 [Member]
Weighted Average Exercise Price (in dollars per share)
Number of Warrants Outstanding (in shares)	181,818
Weighted Average Remaining Contractual Life (Year)	3 years 11 months 4 days
Expiry Date	Apr. 05, 2026
Warrants 4 [Member]
Weighted Average Exercise Price (in dollars per share)
Number of Warrants Outstanding (in shares)	3,982,779
Weighted Average Remaining Contractual Life (Year)	6 months 25 days