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Income Taxes - Schedule of Income Tax Reconciliation (Detail) - USD ($) $ in Thousands	12 Months Ended
	Apr. 30, 2015	Apr. 30, 2014	Apr. 30, 2013
Income Tax Disclosure [Abstract]
Income tax expense at statutory rate	$ 1,831	$ 2,035	$ 1,775
State and local taxes, net of federal income tax benefit (expense)	97	165	128
Tax credits (state, net of federal benefit)	(157)	(134)	(118)
Effects of differing US and foreign tax rates	47	(30)	(106)
Decrease in valuation allowance	(40)	(9)	(14)
Other items, net	(33)	(44)	(125)
Net income tax expense	$ 1,745	$ 1,983	$ 1,540

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Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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