Note 13 - Capital Stock - Summary of Stock-based Compensation Expense (Details) - USD ($) $ in Thousands	3 Months Ended				6 Months Ended
	Jan. 31, 2023	Oct. 31, 2022	Jan. 31, 2022	Oct. 31, 2021	Jan. 31, 2023	Jan. 31, 2022
Share-Based Payment Arrangement, Noncash Expense, Total	$ 1,452		$ 1,194		$ 3,273	$ 2,575
Common stock issued	262	$ 299	399	$ 355
Consultants [Member]
Common stock issued to consultants	127		201		275	506
Amortization of expenses	144		57		372	137
Share-Based Payment Arrangement, Noncash Expense, Total	271		258		647	643
Management [Member]
Amortization of expenses	95		126		228	291
Share-Based Payment Arrangement, Noncash Expense, Total	448		388		935	815
Management [Member] | Restricted Stock Units (RSUs) and Performance Restricted Stock Units (PRSUs) [Member]
Amortization of expenses	353		262		707	524
Employees [Member]
Share-Based Payment Arrangement, Noncash Expense, Total	733		548		1,691	1,117
Common stock issued	240		339		487	612
Employees [Member] | Share-Based Payment Arrangement, Option [Member]
Amortization of expenses	454		209		1,127	505
Employees [Member] | Restricted Stock Units (RSUs) [Member]
Amortization of expenses	$ 39		$ 0		$ 77	$ 0