Note 14 - 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, 2021	Oct. 31, 2020	Jan. 31, 2020	Oct. 31, 2019	Jan. 31, 2021	Jan. 31, 2020
Net loss for the period	$ (3,461,059)	$ (4,963,537)	$ (1,888,661)	$ (5,042,577)	$ (8,424,596)	$ (6,931,238)
Basic Weighted Average Number of Shares (in shares)	198,673,515		182,802,747		194,314,507	182,021,725
Dilutive Stock Options, RSUs, PRSUs and Warrants (in shares)
Diluted Weighted Average Number of Shares (in shares)	198,673,515		182,802,747		194,314,507	182,021,725
NET LOSS PER SHARE, BASIC AND DILUTED (in dollars per share)	$ (0.02)		$ (0.01)		$ (0.04)	$ (0.04)