Note 13 - Capital Stock - Summary of Stock-based Compensation Expense (Details) - USD ($) $ in Thousands	3 Months Ended
	Oct. 31, 2022	Oct. 31, 2021
Share-Based Payment Arrangement, Noncash Expense, Total	$ 1,821	$ 1,381
Common stock issued	299	355
Consultants [Member]
Common stock issued to consultants	148	305
Amortization of expenses	228	80
Share-Based Payment Arrangement, Noncash Expense, Total	376	385
Management [Member]
Amortization of expenses	133	166
Share-Based Payment Arrangement, Noncash Expense, Total	487	428
Management [Member] | Restricted Stock Units (RSUs) and Performance Restricted Stock Units (PRSUs) [Member]
Amortization of expenses	354	262
Employees [Member]
Share-Based Payment Arrangement, Noncash Expense, Total	958	568
Common stock issued	247	272
Employees [Member] | Share-Based Payment Arrangement, Option [Member]
Amortization of expenses	673	296
Employees [Member] | Restricted Stock Units (RSUs) [Member]
Amortization of expenses	$ 38	$ 0