Note 12 - Lease Liabilities - Lease Expenses (Details) - USD ($)	3 Months Ended		6 Months Ended
	Jan. 31, 2021	Jan. 31, 2020	Jan. 31, 2021	Jan. 31, 2020
Operating leases	$ 52,372	$ 59,309	$ 106,833	$ 118,939
Short-term leases	20,313	23,516	42,955	397,029
Total Lease Expenses	$ 72,685	$ 82,825	$ 149,788	$ 515,968