Note 12 - Sales and Cost of Sales - Sales Revenue and Cost of Sales Revenue (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jan. 31, 2026	Jan. 31, 2025	Jan. 31, 2026	Jan. 31, 2025
Revenue	$ 20,200	$ 49,750	$ 20,200	$ 66,837
Cost of revenues	(10,172)	(31,524)	(10,172)	(42,360)
Gross profit	$ 10,028	$ 18,226	$ 10,028	$ 24,477