Employees' Profit Sharing and Savings Plan (Detail Textuals) (USD $)	12 Months Ended
Apr. 30, 2013	Apr. 30, 2012	Apr. 30, 2011
Compensation Related Costs [Abstract]
Estimated profit sharing plan contribution included in salaries and employee benefits	$ 240,000	$ 447,000	$ 500,000

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.

No definition available.

Name:	us-gaap_DeferredCompensationArrangementWithIndividualEmployerContribution
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration