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Employees' Profit Sharing and Savings Plan (Detail Textuals) (USD $) | 9 Months Ended
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Jan. 31, 2015 | Jan. 31, 2014
Compensation Related Costs [Abstract] |  |
Estimated profit sharing plan contribution included in salaries and employee benefits | $ 299,000 us-gaap_DeferredCompensationArrangementWithIndividualEmployerContribution | $ 251,000 us-gaap_DeferredCompensationArrangementWithIndividualEmployerContribution

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- Details
Name: | us-gaap_CompensationRelatedCostsAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- 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