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Note 11 - Treasury Stock and Repurchase Program (Details Textual) - USD ($) | Jul. 31, 2025 | Jun. 30, 2025 | May 31, 2025 | Apr. 30, 2025 | Oct. 21, 2022
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Share Repurchase Program, Authorized, Amount |  |  |  |  | $ 3,000,000
Share Repurchase Program, Remaining Authorized, Amount | $ 699,000 | $ 699,000 | $ 738,000 | $ 758,000 |

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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