Note 17 - Stock-based Compensation - Summary of Stock-based Compensation Expense (Details) - USD ($) $ in Thousands	12 Months Ended
	Jul. 31, 2023	Jul. 31, 2022	Jul. 31, 2021
Share-Based Payment Arrangement, Noncash Expense	$ 5,523	$ 4,681	$ 5,471
Common stock issued	945	1,478	1,594
Share-Based Payment Arrangement, Employee [Member]
Amortization of expenses	1,727	960	982
Share-Based Payment Arrangement, Noncash Expense	2,747	2,185	2,182
Common stock issued	888	1,187	1,200
Amortization of RSU expenses	132	38	0
Consultants [Member]
Common stock issued to consultants	445	770	877
Amortization of expenses	561	220	288
Share-Based Payment Arrangement, Noncash Expense	1,006	990	1,165
Management [Member]
Amortization of expenses	400	471	774
Share-Based Payment Arrangement, Noncash Expense	1,770	1,506	2,124
Common stock issued	0	0	135
Management [Member] | Restricted Stock Units (RSUs) and Performance Restricted Stock Units (PRSUs) [Member]
Amortization of expenses	$ 1,370	$ 1,035	$ 1,215