Note 12 - Stock-based Compensation - Summary of Stock-based Compensation Expense (Details) - USD ($) $ in Thousands	3 Months Ended
	Oct. 31, 2024	Oct. 31, 2023
Share-Based Payment Arrangement, Noncash Expense	$ 1,821	$ 1,572
Share-Based Payment Arrangement, Employee [Member]
Amortization of stock option expenses	434	632
Amortization of RSU expenses	52	17
Share-Based Payment Arrangement, Noncash Expense	486	649
Consultants [Member]
Common stock issued to consultants	88	0
Amortization of stock option expenses	55	121
Amortization of RSU expenses	17	0
Share-Based Payment Arrangement, Noncash Expense	160	121
Management [Member]
Amortization of stock option expenses	207	208
Amortization of RSU expenses	968	594
Share-Based Payment Arrangement, Noncash Expense	$ 1,175	$ 802