Note 15 - Loss Per Share - Weighted Average Number of Shares Used in the Calculation of the Basic and Diluted Loss Per Share (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
Net loss for the period	$ (5,474,267)	$ (2,073,826)	$ (3,461,059)	$ (4,963,537)	$ (7,548,093)	$ (8,424,596)
Basic Weighted Average Number of Shares (in shares)	269,120,537		198,673,515		257,989,930	194,314,507
Dilutive Stock Options, RSUs, PRSUs and Warrants (in shares)	0		0		0	0
Diluted Weighted Average Number of Shares (in shares)	269,120,537		198,673,515		257,989,930	194,314,507
NET LOSS PER SHARE, BASIC AND DILUTED (in dollars per share)	$ (0.02)		$ (0.02)		$ (0.03)	$ (0.04)