Note 3 - Computation of Net Income (Loss) Per Share - Anti-dilutive Shares (Details) - shares shares in Thousands	3 Months Ended
Apr. 30, 2021	Apr. 30, 2020
Common Class A [Member]
Antidilutive securities excluded from computation of net income per share (in shares)	2	1,845
Common Class B [Member]
Antidilutive securities excluded from computation of net income per share (in shares)	0	150

Securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) or earnings per unit (EPU) in the future that were not included in the computation of diluted EPS or EPU because to do so would increase EPS or EPU amounts or decrease loss per share or unit amounts for the period presented.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 260
-SubTopic 10
-Section 50
-Paragraph 1
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=124432515&loc=d3e3550-109257

Name:	us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount
Namespace Prefix:	us-gaap_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration