Note 2 - Earnings Per Share - Schedule of Anti-dilutive Shares (Details) - shares	6 Months Ended
Nov. 30, 2024	Nov. 30, 2023
Preferred stock convertible into common stock (in shares)	3,833,333	3,333,333
Preferred Stock Into Common Stock [Member]
Preferred stock convertible into common stock (in shares)	3,333,333	3,333,333
Warrants Exercisable Into Common Stock [Member]
Preferred stock convertible into common stock (in shares)	500,000	0

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
-Topic 260
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Subparagraph (c)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482662/260-10-50-1

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