Note 14 - Capital Stock - Continuity Schedule of Outstanding Share Purchase Warrants (Details) - $ / shares	12 Months Ended
	Jul. 31, 2022	Jul. 31, 2021	Jul. 31, 2020
Balance, Number of Warrants (in shares)	5,387,323	7,721,981	19,443,910
Balance, Weighted Average Exercise Price (in dollars per share)	$ 1.90	$ 2.03	$ 1.94
Issued, Number of Warrants (in shares)			300,000
Issued, Weighted Average Exercise Price (in dollars per share)			$ 1.38
Expired, Number of Warrants (in shares)		(1,109,304)	(12,021,929)
Expired, Weighted Average Exercise Price (in dollars per share)		$ 1.87	$ 1.87
Exercised, Number of Warrants (in shares)	(1,771,869)	(8,240,505)
Exercised, Weighted Average Exercise Price (in dollars per share)	$ 1.88	$ 1.99
Balance, Number of Warrants (in shares)	3,615,454	5,387,323	7,721,981
Balance, Weighted Average Exercise Price (in dollars per share)	$ 1.92	$ 1.90	$ 2.03
September 2020 Offering [Member]
Issued, Number of Warrants (in shares)		6,833,333
Issued, Weighted Average Exercise Price (in dollars per share)		$ 1.80
April 2021 Offering [Member]
Issued, Number of Warrants (in shares)		181,818
Issued, Weighted Average Exercise Price (in dollars per share)		$ 4.13