Note 14 - Capital Stock - Summary of Stock-based Compensation Expense (Details) - USD ($)	3 Months Ended						9 Months Ended
	Apr. 30, 2021	Jan. 31, 2021	Oct. 31, 2020	Apr. 30, 2020	Jan. 31, 2020	Oct. 31, 2019	Apr. 30, 2021	Apr. 30, 2020
Share-based Payment Arrangement, Noncash Expense, Total	$ 1,167,727			$ 695,645			$ 3,764,300	$ 2,411,281
Common stock issued	308,131	$ 328,362	$ 265,590	247,202	$ 234,792	$ 223,362
Settlement of share issuance obligation								(15,189)
Consultants [Member]
Common stock issued to consultants	229,047			131,516			468,364	365,274
Amortization of expenses	54,593			57,130			224,295	157,655
Share-based Payment Arrangement, Noncash Expense, Total	283,640			188,646			692,659	522,929
Management [Member]
Amortization of expenses	154,531			100,317			614,579	506,422
Share-based Payment Arrangement, Noncash Expense, Total	455,045			259,718			1,533,849	1,004,816
Common stock issued				24,308				93,115
Management [Member] | Restricted Stock Units (RSUs) and Performance Restricted Stock Units (PRSUs) [Member]
Amortization of expenses	300,514			135,093			919,270	405,279
Employees [Member]
Amortization of expenses	164,558			89,154			798,796	482,573
Share-based Payment Arrangement, Noncash Expense, Total	429,042			247,281			1,537,792	898,725
Common stock issued	$ 264,484			$ 158,127			$ 738,996	$ 416,152