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Note 5 - Employees' Profit Sharing and Savings Plan (Details Textual) - USD ($) | 6 Months Ended
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Oct. 31, 2016 | Oct. 31, 2015
Deferred Compensation Arrangement with Individual, Employer Contribution | $ 214,000 | $ 200,000

X
- Definition The amount of payment into the fund established for purposes of making future disbursements to the individual in accordance with the terms and understanding of the deferred compensation arrangement. + References No definition available. + Details
Name: | us-gaap_DeferredCompensationArrangementWithIndividualEmployerContribution
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration