Note 14 - 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		6 Months Ended
	Jan. 31, 2025	Jan. 31, 2024	Jan. 31, 2025	Jan. 31, 2024
Revenue	$ 49,750	$ 116	$ 66,837	$ 224
Cost of revenues	(31,524)	(97)	(42,360)	(187)
Sale of Inventory [Member]
Revenue	49,750	0	66,837	0
Cost of revenues	(31,524)	0	(42,360)	0
Toll Processing Services [Member]
Revenue	0	116	0	224
Cost of revenues	$ 0	$ (97)	$ 0	$ (187)