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
	Oct. 31, 2020	Oct. 31, 2019
Net loss for the period	$ (4,963,537)	$ (5,042,577)
Basic Weighted Average Number of Shares (in shares)	189,955,499	181,240,702
Dilutive Stock Options, RSUs, PRSUs and Warrants (in shares)
Diluted Weighted Average Number of Shares (in shares)	189,955,499	181,240,702
NET LOSS PER SHARE, BASIC AND DILUTED (in dollars per share)	$ (0.03)	$ (0.03)