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Note 13 - Treasury Stock and Repurchase Program (Details Textual) - USD ($)	Apr. 30, 2025	Apr. 30, 2024	Apr. 30, 2023	Oct. 31, 2022	Oct. 21, 2022	May 31, 2022	Apr. 30, 2022	Mar. 31, 2022	Jul. 31, 2021	Apr. 30, 2021	Apr. 30, 2020
Share Repurchase Program, Authorized, Amount				$ 3,000,000	$ 3,000,000	$ 3,000,000		$ 2,000,000	$ 2,000,000		$ 2,000,000
Share Repurchase Program, Remaining Authorized, Amount	$ 758,000	$ 1,211,000	$ 1,266,000				$ 1,241,000			$ 474,000	$ 2,000,000

X

- Definition

Amount authorized for purchase of share under share repurchase plan. Includes, but is not limited to, repurchase of stock and unit of ownership.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 505
-SubTopic 30
-Name Accounting Standards Codification
-Section 50
-Paragraph 4
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481520/505-30-50-4

+ Details

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Namespace Prefix:	srt_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

Amount remaining authorized for purchase of share under share repurchase plan. Includes, but is not limited to, repurchase of stock and unit of ownership.

+ References

No definition available.

+ Details

Name:	us-gaap_StockRepurchaseProgramRemainingAuthorizedRepurchaseAmount1
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant