Note 13 - Lease Liabilities - Lease Expenses (Details) - USD ($)	3 Months Ended		9 Months Ended
	Apr. 30, 2021	Apr. 30, 2020	Apr. 30, 2021	Apr. 30, 2020
Operating leases	$ 56,195	$ 63,073	$ 163,028	$ 182,012
Short-term leases	365,027	23,289	407,982	420,318
Total Lease Expenses	$ 421,222	$ 86,362	$ 571,010	$ 602,330