Note 13 - Lease Liabilities - Lease Expenses (Details) - USD ($) $ in Thousands	12 Months Ended
	Jul. 31, 2022	Jul. 31, 2021	Jul. 31, 2020
Operating Leases	$ 274	$ 220	$ 230
Short-term Leases	1,401	607	445
Total Lease Expenses	$ 1,675	$ 827	$ 675