Note 18 - Sales and Service Revenue and Cost of Sales and Services - Sales and Service Revenue and Cost of Sales and Service Revenue (Details) - USD ($) $ in Thousands	12 Months Ended
	Jul. 31, 2024	Jul. 31, 2023	Jul. 31, 2022
Revenue	$ 224	$ 164,389	$ 23,161
Cost of revenues	(187)	(114,719)	(15,868)
Sale of Inventory [Member]
Revenue	0	163,950	22,946
Cost of revenues	0	(114,353)	(15,689)
Toll Processing Services [Member]
Revenue	224	439	215
Cost of revenues	$ (187)	$ (366)	$ (179)