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Income Taxes - Schedule of Income Tax Reconciliation (Detail) - USD ($) $ in Thousands	12 Months Ended
	Apr. 30, 2017	Apr. 30, 2016	Apr. 30, 2015
Income Tax Disclosure [Abstract]
Income tax expense at statutory rate	$ 2,294	$ 1,952	$ 1,831
State and local taxes, net of federal income tax benefit (expense)	100	102	97
Tax credits (state, net of federal benefit)	(110)	(407)	(157)
Effects of differing US and foreign tax rates	(7)	173	47
Increase (decrease) in valuation allowance	82	(10)	(40)
Other items, net	(233)	52	(33)
Net income tax expense	$ 2,126	$ 1,862	$ 1,745

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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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