Note 17 - 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, 2025	Jul. 31, 2024	Jul. 31, 2023
Revenue	$ 66,837	$ 224	$ 164,389
Cost of revenues	(42,360)	(187)	(114,719)
Sale of Inventory [Member]
Revenue	66,837	0	163,950
Cost of revenues	(42,360)	0	(114,353)
Toll Processing Services [Member]
Revenue	0	224	439
Cost of revenues	$ 0	$ (187)	$ (366)