Note 13 - Capital Stock - Summary of Stock-based Compensation Expense (Details) - USD ($)	3 Months Ended				6 Months Ended
	Jan. 31, 2022	Oct. 31, 2021	Jan. 31, 2021	Oct. 31, 2020	Jan. 31, 2022	Jan. 31, 2021
Share-based Payment Arrangement, Noncash Expense, Total	$ 1,194,206		$ 1,218,058		$ 2,574,866	$ 2,596,573
Common stock issued	399,448	$ 355,228	328,362	$ 265,590
Consultants [Member]
Common stock issued to consultants	201,115		119,847		505,702	239,317
Amortization of expenses	56,802		65,774		136,575	169,702
Share-based Payment Arrangement, Noncash Expense, Total	257,917		185,621		642,277	409,019
Management [Member]
Amortization of expenses	125,608		206,317		291,157	460,048
Share-based Payment Arrangement, Noncash Expense, Total	387,698		515,695		815,488	1,078,804
Management [Member] | Restricted Stock Units (RSUs) and Performance Restricted Stock Units (PRSUs) [Member]
Amortization of expenses	262,090		309,378		524,331	618,756
Employees [Member]
Amortization of expenses	209,497		255,100		505,094	634,238
Share-based Payment Arrangement, Noncash Expense, Total	548,591		516,742		1,117,101	1,108,750
Common stock issued	$ 339,094		$ 261,642		$ 612,007	$ 474,512