Note 12 - Capital Stock - Schedule of Outstanding Unvested Stock Options (Details)	3 Months Ended
	Oct. 31, 2021 $ / shares shares
Nonvested balance (in shares) | shares	3,891,207
Nonvested, Weighted Average Grant-Date Fair Value (in dollars per share) | $ / shares	$ 0.66
Granted, number of stock options (in shares) | shares	10,000
Granted, Weighted Average Grant-Date Fair Value (in dollars per share) | $ / shares	$ 1.73
Vested (in shares) | shares	(265,427)
Vested, Weighted Average Grant-Date Fair Value (in dollars per share) | $ / shares	$ 0.87
Nonvested balance (in shares) | shares	3,635,780
Nonvested, Weighted Average Grant-Date Fair Value (in dollars per share) | $ / shares	$ 0.64