Note 13 - Capital Stock - Summary of Stock-based Compensation Expense (Details) - USD ($)	3 Months Ended				6 Months Ended
	Jan. 31, 2021	Oct. 31, 2020	Jan. 31, 2020	Oct. 31, 2019	Jan. 31, 2021	Jan. 31, 2020
Share-based Payment Arrangement, Noncash Expense, Total	$ 1,218,058		$ 798,250		$ 2,596,573	$ 1,715,636
Common stock issued	328,362	$ 265,590	234,792	$ 223,362
Settlement of share issuance obligation						(15,189)
Consultants [Member]
Common stock issued to consultants	119,847		126,150		239,317	233,758
Amortization of expenses	65,774		53,554		169,702	100,525
Share-based Payment Arrangement, Noncash Expense, Total	185,621		179,704		409,019	334,283
Management [Member]
Amortization of expenses	206,317		162,728		460,048	406,105
Share-based Payment Arrangement, Noncash Expense, Total	515,695		331,921		1,078,804	745,098
Common stock issued			34,100			68,807
Management [Member] | Restricted Stock Units (RSUs) and Performance Restricted Stock Units (PRSUs) [Member]
Amortization of expenses	309,378		135,093		618,756	270,186
Employees [Member]
Amortization of expenses	255,100		156,628		634,238	393,419
Share-based Payment Arrangement, Noncash Expense, Total	516,742		286,625		1,108,750	651,444
Common stock issued	$ 261,642		$ 129,997		$ 474,512	$ 258,025