Note 12 - Stock-based Compensation - Summary of Stock-based Compensation Expense (Details) - USD ($) $ in Thousands	3 Months Ended
Oct. 31, 2023	Oct. 31, 2022
Share-Based Payment Arrangement, Noncash Expense	$ 1,572	$ 1,821
Common stock issued		299
Consultants [Member]
Common stock issued to consultants	0	148
Share-Based Payment Arrangement, Noncash Expense	121	376
Consultants [Member] \| Share-Based Payment Arrangement, Option [Member]
Amortization of expenses	121	228
Management [Member]
Share-Based Payment Arrangement, Noncash Expense	802	487
Management [Member] \| Share-Based Payment Arrangement, Option [Member]
Amortization of expenses	208	133
Management [Member] \| Restricted Stock Units (RSUs) and Performance Restricted Stock Units (PRSUs) [Member]
Amortization of expenses	594	354
Employees [Member]
Share-Based Payment Arrangement, Noncash Expense	649	958
Common stock issued	0	247
Employees [Member] \| Share-Based Payment Arrangement, Option [Member]
Amortization of expenses	632	673
Employees [Member] \| Restricted Stock Units (RSUs) [Member]
Amortization of expenses	$ 17	$ 38

The common stock expense associated with consulting services.

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Amount of noncash expense for share-based payment arrangement.

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-Name Accounting Standards Codification
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Value, after forfeiture, of shares issued under share-based payment arrangement. Excludes employee stock ownership plan (ESOP).

+ References

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Amount of noncash expense for option under share-based payment arrangement.

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