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Note 13 - Treasury Stock and Repurchase Program (Details Textual) - USD ($) | 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 | Apr. 30, 2019
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Stock 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 | $ 1,211,000 | $ 1,266,000 |  |  |  | $ 1,241,000 |  |  | $ 474,000 | $ 2,000,000 | $ 1,438,000

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- 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
Name: | srt_StockRepurchaseProgramAuthorizedAmount1
Namespace Prefix: | srt_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- 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