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

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- Details

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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

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Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration