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Consolidated Condensed Statements of Comprehensive Income (unaudited) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Jan. 31, 2015	Jan. 31, 2014	Jan. 31, 2015	Jan. 31, 2014
Statement Of Other Comprehensive Income [Abstract]
Net income	$ 2,177us-gaap_NetIncomeLoss	$ 2,026us-gaap_NetIncomeLoss	$ 6,195us-gaap_NetIncomeLoss	$ 5,087us-gaap_NetIncomeLoss
Other comprehensive income (loss), net of tax:
Change in unrealized gains on securities, net of taxes	(16)us-gaap_OtherComprehensiveIncomeAvailableforsaleSecuritiesAdjustmentNetOfTaxPortionAttributableToParent	(87)us-gaap_OtherComprehensiveIncomeAvailableforsaleSecuritiesAdjustmentNetOfTaxPortionAttributableToParent	(33)us-gaap_OtherComprehensiveIncomeAvailableforsaleSecuritiesAdjustmentNetOfTaxPortionAttributableToParent	(48)us-gaap_OtherComprehensiveIncomeAvailableforsaleSecuritiesAdjustmentNetOfTaxPortionAttributableToParent
Other comprehensive income (loss)	(16)us-gaap_OtherComprehensiveIncomeLossNetOfTax	(87)us-gaap_OtherComprehensiveIncomeLossNetOfTax	(33)us-gaap_OtherComprehensiveIncomeLossNetOfTax	(48)us-gaap_OtherComprehensiveIncomeLossNetOfTax
Comprehensive income	$ 2,161us-gaap_ComprehensiveIncomeNetOfTax	$ 1,939us-gaap_ComprehensiveIncomeNetOfTax	$ 6,162us-gaap_ComprehensiveIncomeNetOfTax	$ 5,039us-gaap_ComprehensiveIncomeNetOfTax

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- Definition

Amount after tax of increase (decrease) in equity from transactions and other events and circumstances from net income and other comprehensive income, attributable to parent entity. Excludes changes in equity resulting from investments by owners and distributions to owners.

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The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.

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Amount after tax and 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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