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Investments (Detail Textuals) (USD $)	6 Months Ended
	Oct. 31, 2014	Oct. 31, 2013	Apr. 30, 2014
Schedule of Available-for-sale Securities [Line Items]
Aggregate cost of equity securities available for sale	$ 8,871,000		$ 8,847,000
Fair value of equity securities	9,223,000		9,226,000
Increase (decreases) in gross unrealized gains on equity securities classified as available-for-sale	(27,000)	61,000
Equity Securities
Schedule of Available-for-sale Securities [Line Items]
Increase (decreases) in gross unrealized gains on equity securities classified as available-for-sale	(27,000)	61,000
Deferred taxes on unrealized gains on securities	10,000	21,000
Accumulated other comprehensive income, net of tax	353,000		379,000
Deferred taxes on accumulated other comprehensive income	$ 124,000		$ 133,000

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Amount before tax of unrealized gain in accumulated other comprehensive income (AOCI) on investments in equity securities classified as available-for-sale.

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Amount of investment in debt and equity securities categorized neither as held-to-maturity nor trading.

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Amount of deferred tax liability attributable to taxable temporary differences from unrealized gains in other comprehensive income.

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Amount before tax, after reclassification adjustments, of appreciation (loss) in value of unsold available-for-sale securities, attributable to parent entity. Excludes amounts related to other than temporary impairment (OTTI) loss.

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