Note 6 - Leases - Lease Costs (Details) - USD ($) $ in Thousands		12 Months Ended
		Jan. 31, 2021	Jan. 31, 2020
Amortization of ROU assets		$ 214	$ 208
Interest on lease liabilities		69	58
Operating lease costs		2,570	2,326
Short-term lease costs (1)	[1]	398	425
Sub-lease income		(81)	(81)
Total Lease costs		$ 3,170	$ 2,936

[1] Includes variable lease costs, which are immaterial