Note 5 - Accrued Expenses and Other Current Liabilities - Level 3 Transactions (Details) - USD ($) $ in Thousands	3 Months Ended
Apr. 30, 2022	Apr. 30, 2021
Beginning balance	$ 0	$ 296
Change in value	0	(296)
Ending balance	$ 0	$ 0

Fair value of financial instrument classified as a liability measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)
-URI https://asc.fasb.org/extlink&oid=126976982&loc=d3e19207-110258

Name:	us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationsRecurringBasisLiabilityValue
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant