Note 6 - Impairment of Long-lived Assets (Details Textual) - USD ($) $ in Thousands	1 Months Ended	3 Months Ended		9 Months Ended
	Jul. 31, 2022	Oct. 31, 2022	Oct. 31, 2021	Oct. 31, 2022	Oct. 31, 2021
Impairment, Long-Lived Asset, Held-for-Use, Total		$ 0	$ 0	$ 0	$ 0
Insurance Policy Deductible Amount	$ 50
Goodwill, Impairment Loss		0	0	0	0
Nonoperating Income (Expense) [Member]
Insurance Proceeds Offset by Write off of Damaged Inventory and Fixed Assets		$ 100	$ 100	$ 100	$ 100