Note 13 - 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, 2020	Oct. 31, 2019	Jan. 31, 2019	Oct. 31, 2018	Jan. 31, 2020	Jan. 31, 2019
Net loss for the period	$ (1,888,661)	$ (5,042,577)	$ (2,349,674)	$ (3,451,426)	$ (6,931,238)	$ (5,801,100)
Basic Weighted Average Number of Shares (in shares)	182,802,747		177,061,313		182,021,725	171,729,303
Dilutive Stock Options, Warrants, RSUs and PRSUs (in shares)
Diluted Weighted Average Number of Shares (in shares)	182,802,747		177,061,313		182,021,725	171,729,303
NET LOSS PER SHARE, BASIC AND DILUTED (in dollars per share)	$ (0.01)		$ (0.01)		$ (0.04)	$ (0.03)