Note 11 - Lease Liabilities - Lease Expenses (Details) - USD ($)	3 Months Ended	6 Months Ended
	Jan. 31, 2020	Jan. 31, 2020
Operating leases	$ 59,309	$ 118,939
Short-term leases	23,516	397,029
Total Lease Expenses	$ 82,825	$ 515,968