Note 10 - Leases - Lease Costs (Details) - USD ($) $ in Thousands		3 Months Ended		6 Months Ended
		Jul. 31, 2022	Jul. 31, 2021	Jul. 31, 2022	Jul. 31, 2021
Amortization of ROU assets		$ 62	$ 65	$ 125	$ 119
Interest on lease liabilities		8	15	18	28
Operating lease costs		694	625	587	1,273
Short-term lease costs (1)	[1]	13	102	72	195
Sub-lease income		(27)	(20)	(40)	(40)
Total Lease costs		$ 750	$ 787	$ 762	$ 1,575

[1] Includes variable lease costs, which are immaterial