Note 16 - Sales and Service Revenue and Cost of Sales and Services - Sales and Service Revenue and Cost of Sales and Service Renue (Details) - USD ($) $ in Thousands	12 Months Ended
	Jul. 31, 2022	Jul. 31, 2021	Jul. 31, 2020
SALES AND SERVICE REVENUE	$ 23,161	$ 0	$ 0
COST OF SALES AND SERVICES	(15,868)	0	0
Sale of Inventory [Member]
SALES AND SERVICE REVENUE	22,946	0	0
COST OF SALES AND SERVICES	(15,689)	0	0
Toll Processing Services [Member]
SALES AND SERVICE REVENUE	215	0	0
COST OF SALES AND SERVICES	$ (179)	$ 0	$ 0