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Income Taxes (Details Textual) (USD $)	6 Months Ended
	Oct. 31, 2012	Oct. 31, 2011
Income Taxes (Textual) [Abstract]
Estimated Future Income Tax Benefit	$ 5,400,000
Unrecognized tax benefits	691,000
Accrued interest and penalties related to uncertain tax positions	$ 117,000	$ 111,000
Unrecognized tax benefits expected reversal period	12 months

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Unrecognized tax benefits expected reversal period.

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The component of income tax expense for the period representing the increase (decrease) in the entity's deferred tax assets and liabilities pertaining to continuing operations.

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The gross amount of unrecognized tax benefits pertaining to uncertain tax positions taken in tax returns as of the balance sheet date.

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This element represents the total of accruals as of the date of the statement of financial position for interest recognized for an underpayment of income taxes computed by applying the applicable statutory rate of interest to the difference between a tax position recognized for financial reporting purposes and the amount previously taken or expected to be taken in a tax return of the entity and the amount of statutory penalties for a tax position claimed or expected to be claimed by the entity, in its tax return, that does not meet the minimum statutory threshold to avoid payment of penalties.

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