Note 12 - Stock-based Compensation - Summary of Stock-based Compensation Expense (Details) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
Jan. 31, 2024	Jan. 31, 2023	Oct. 31, 2022	Jan. 31, 2024	Jan. 31, 2023
Share-Based Payment Arrangement, Noncash Expense	$ 1,312	$ 1,452		$ 2,884	$ 3,273
Common stock issued to employees		262	$ 299
Consultants [Member]
Common stock issued to consultants	0	127		0	275
Amortization of stock option expenses	94	144		215	372
Consultants [Member] \| Share-Based Payment Arrangement, Option [Member]
Share-Based Payment Arrangement, Noncash Expense	94	271		215	647
Management [Member]
Share-Based Payment Arrangement, Noncash Expense	755	448		1,557	935
Management [Member] \| Share-Based Payment Arrangement, Option [Member]
Amortization of stock option expenses	160	95		368	228
Management [Member] \| Restricted Stock Units (RSUs) and Performance Restricted Stock Units (PRSUs) [Member]
Amortization of stock option expenses	595	353		1,189	707
Employees [Member]
Share-Based Payment Arrangement, Noncash Expense	463	733		1,112	1,691
Common stock issued to employees	0	240		0	487
Employees [Member] \| Share-Based Payment Arrangement, Option [Member]
Amortization of stock option expenses	445	454		1,077	1,127
Employees [Member] \| Restricted Stock Units (RSUs) [Member]
Amortization of stock option expenses	$ 18	$ 39		$ 35	$ 77

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).

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

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