Note 13 - 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	3 Months Ended
	Oct. 31, 2024	Oct. 31, 2023
Revenue	$ 17,087	$ 108
Cost of revenues	(10,836)	(90)
Sale of Inventory [Member]
Revenue	17,087	0
Cost of revenues	(10,836)	0
Toll Processing Services [Member]
Revenue	0	108
Cost of revenues	$ 0	$ (90)