Note 12 - Capital Stock - Summary of Stock-based Compensation Expense (Details) - USD ($)	3 Months Ended				6 Months Ended
	Jan. 31, 2020	Oct. 31, 2019	Jan. 31, 2019	Oct. 31, 2018	Jan. 31, 2020	Jan. 31, 2019
	$ 798,250		$ 747,342		$ 1,715,636	$ 1,588,866
Common stock issued	234,792	$ 223,362	290,238	$ 239,255
Settlement of share issuance obligation					(15,189)
Consultants [Member]
Common stock issued for consulting services	126,150		229,806		233,758	360,610
Amortization of stock option expenses	53,554		30,319		100,525	84,720
	179,704		260,125		334,283	445,330
Management [Member]
Amortization of stock option expenses	162,728		139,900		406,105	356,704
	331,921		175,539		745,098	427,687
Common stock issued	34,100		35,639		68,807	70,983
Amortization of RSU & PRSU expenses	135,093				270,186
Employees [Member]
Amortization of stock option expenses	156,628		186,806		393,419	467,154
	286,625		311,678		651,444	715,849
Common stock issued	$ 129,997		$ 124,872		$ 258,025	$ 248,695