Note 14 - Loss Per Share - Weighted Average Number of Shares Used in the Calculation of the Basic and Diluted Loss Per Share (Details) - USD ($)	12 Months Ended
	Jul. 31, 2020	Jul. 31, 2019	Jul. 31, 2018
Net loss for the year	$ (14,610,516)	$ (17,152,789)	$ (17,826,634)
Basic Weighted Average Number of Shares (in shares)	183,041,766	175,844,624	157,123,025
Dilutive Stock Options, RSUs, PRSUs and Warrants (in shares)
Diluted Weighted Average Number of Shares (in shares)	183,041,766	175,844,624	157,123,025
NET LOSS PER SHARE, BASIC AND DILUTED (in dollars per share)	$ (0.08)	$ (0.10)	$ (0.11)