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Note 5 - Employees' Profit Sharing and Savings Plan (Details Textual) - USD ($) | 6 Months Ended
--- | ---
Oct. 31, 2017 | Oct. 31, 2016
Deferred Compensation Arrangement with Individual, Contributions by Employer | $ 213,000 | $ 214,000

X
- Definition Amount of contributions made by employer into fund established for purposes of making future disbursement to individual in accordance with deferred compensation arrangement. + References No definition available. + Details
Name: | us-gaap_DeferredCompensationArrangementWithIndividualContributionsByEmployer
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration