Note 6 - Restricted Cash - Restricted Cash (Details) - USD ($)	3 Months Ended	12 Months Ended
	Oct. 31, 2020	Jul. 31, 2020
Restricted cash, beginning of period	$ 1,839,216	$ 1,821,392
Interest received	44	17,824
Restricted cash, end of period	$ 1,839,260	$ 1,839,216