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Note 8 - Employees' Profit Sharing and Savings Plan (Details Textual) - USD ($) | 12 Months Ended
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Apr. 30, 2016 | Apr. 30, 2015 | Apr. 30, 2014
Deferred Compensation Arrangement with Individual, Employer Contribution | $ 473,000 | $ 422,000 | $ 373,000

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