Note 12 - Capital Stock - Schedule of Outstanding Unvested Stock Options (Details)	3 Months Ended
	Oct. 31, 2020 $ / shares shares
Nonvested balance (in shares) | shares	6,797,471
Nonvested, Weighted Average Grant-Date Fair Value (in dollars per share) | $ / shares	$ 0.46
Vested (in shares) | shares	(718,755)
Vested, Weighted Average Grant-Date Fair Value (in dollars per share) | $ / shares	$ 0.46
Nonvested balance (in shares) | shares	6,078,716
Nonvested, Weighted Average Grant-Date Fair Value (in dollars per share) | $ / shares	$ 0.46