Note 10 - Restricted Cash - Restricted Cash (Details) - USD ($) $ in Thousands	12 Months Ended
	Jul. 31, 2023	Jul. 31, 2022
Balance, beginning of year	$ 7,251	$ 2,038
Restricted cash received from U1A Acquisition (Note 5)	0	13,755
(Release) addition of surety bond collateral	0	(8,550)
Interest received	0	8
Balance, end of year	$ 7,251	$ 7,251