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Note 13 - Treasury Stock and Repurchase Program (Details Textual) - USD ($) | Oct. 31, 2022 | Oct. 21, 2022 | May 31, 2022 | Mar. 31, 2022 | Jul. 31, 2021 | Apr. 30, 2020
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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

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- Definition Amount of stock repurchase plan authorized. + References No definition available. + Details
Name: | us-gaap_StockRepurchaseProgramAuthorizedAmount1
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant