Note 14 - Capital Stock - Schedule of Outstanding Stock Options (Details) - $ / shares	3 Months Ended				9 Months Ended
	Apr. 30, 2021	Jan. 31, 2021	Oct. 31, 2020	Apr. 30, 2020	Apr. 30, 2021	Apr. 30, 2020
Balance, number of stock options (in shares)	13,070,468	14,171,250	15,514,750		15,514,750
Balance, Weighted Average Exercise Price (in dollars per share)	$ 1.10	$ 1.10	$ 1.13		$ 1.13
Exercised, number of stock options (in shares)	(1,942,848)	(1,100,782)	(28,500)		(3,072,130)
Exercised Options, Weighted Average Exercise Price (in dollars per share)	$ 1.11	$ 1.11	$ 0.93
Expired, number of stock options (in shares)			(1,315,000)
Expired, Weighted Average Exercise Price (in dollars per share)			$ 1.43
Granted, number of stock options (in shares)	42,490
Granted, Weighted Average Exercise Price (in dollars per share)	$ 2.26
Balance, number of stock options (in shares)	11,170,110	13,070,468	14,171,250		11,170,110
Balance, Weighted Average Exercise Price (in dollars per share)	$ 1.11	$ 1.10	$ 1.10		$ 1.11