Note 12 - Stock-based Compensation - Summary of Stock-based Compensation Expense (Details) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
Apr. 30, 2024	Apr. 30, 2023	Jan. 31, 2023	Oct. 31, 2022	Apr. 30, 2024	Apr. 30, 2023
Share-Based Payment Arrangement, Noncash Expense	$ 1,103	$ 1,182			$ 3,987	$ 4,455
Common stock issued to employees		211	$ 262	$ 299
Consultants [Member]
Common stock issued to consultants	0	107			0	382
Amortization of stock option expenses	87	95			302	467
Consultants [Member] \| Share-Based Payment Arrangement, Option [Member]
Share-Based Payment Arrangement, Noncash Expense	87	202			302	849
Management [Member]
Share-Based Payment Arrangement, Noncash Expense	705	441			2,262	1,376
Management [Member] \| Share-Based Payment Arrangement, Option [Member]
Amortization of stock option expenses	120	95			488	323
Management [Member] \| Restricted Stock Units (RSUs) and Performance Restricted Stock Units (PRSUs) [Member]
Amortization of stock option expenses	585	346			1,774	1,053
Employees [Member]
Share-Based Payment Arrangement, Noncash Expense	311	539			1,423	2,230
Common stock issued to employees	0	188			0	675
Employees [Member] \| Share-Based Payment Arrangement, Option [Member]
Amortization of stock option expenses	285	314			1,362	1,441
Employees [Member] \| Restricted Stock Units (RSUs) [Member]
Amortization of stock option expenses	$ 26	$ 37			$ 61	$ 114

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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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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