Note 12 - Capital Stock - Continuity Schedule of Outstanding Share Purchase Warrants (Details)	3 Months Ended
	Oct. 31, 2020 $ / shares shares
Balance, Number of Warrants (in shares) | shares	7,721,981
Balance, Weighted Average Exercise Price (in dollars per share) | $ / shares	$ 2.03
Issued, Number of Warrants (in shares) | shares	6,833,333
Issued, Weighted Average Exercise Price (in dollars per share) | $ / shares	$ 1.80
Balance, Number of Warrants (in shares) | shares	14,555,314
Balance, Weighted Average Exercise Price (in dollars per share) | $ / shares	$ 1.92