Note 13 - Capital Stock - Schedule of Outstanding Stock Options (Details) - $ / shares	3 Months Ended				9 Months Ended
	Apr. 30, 2022	Jan. 31, 2022	Oct. 31, 2021	Apr. 30, 2021	Apr. 30, 2022	Apr. 30, 2021
Balance, number of stock options (in shares)	9,063,956	9,323,790	10,404,333		10,404,333
Balance, Weighted Average Exercise Price (in dollars per share)	$ 1.20	$ 1.20	$ 1.21		$ 1.21
Granted, number of stock options (in shares)			10,000
Granted, Weighted Average Exercise Price (in dollars per share)			$ 2.89
Exercised, number of stock options (in shares)	(1,182,605)	(244,834)	(1,030,543)	(1,942,848)	(2,457,982)	(3,072,130)
Exercised Options, Weighted Average Exercise Price (in dollars per share)	$ 1.15	$ 1.27	$ 1.18
Expired, number of stock options (in shares)		(15,000)	(60,000)
Expired, Weighted Average Exercise Price (in dollars per share)		$ 1.36	$ 2.78
Balance, number of stock options (in shares)	7,881,351	9,063,956	9,323,790		7,881,351
Balance, Weighted Average Exercise Price (in dollars per share)	$ 1.21	$ 1.20	$ 1.20		$ 1.21