Note 13 - Stock-based Compensation - Summary of Stock-based Compensation Expense (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jan. 31, 2025	Jan. 31, 2024	Jan. 31, 2025	Jan. 31, 2024
Share-Based Payment Arrangement, Noncash Expense	$ 1,554	$ 1,312	$ 3,377	$ 2,884
Share-Based Payment Arrangement, Employee [Member]
Amortization of stock option expenses	273	445	707	1,077
Amortization of RSU expenses	75	18	127	35
Share-Based Payment Arrangement, Noncash Expense	348	463	834	1,112
Consultants [Member]
Common stock issued to consultants	0	0	88	0
Amortization of stock option expenses	42	94	97	215
Amortization of RSU expenses	15	0	33	0
Share-Based Payment Arrangement, Noncash Expense	57	94	218	215
Management [Member]
Amortization of stock option expenses	172	160	379	368
Amortization of RSU expenses	977	595	1,946	1,189
Share-Based Payment Arrangement, Noncash Expense	$ 1,149	$ 755	$ 2,325	$ 1,557