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Income Taxes - Schedule of Income Tax Reconciliation (Detail) - USD ($) $ in Thousands	12 Months Ended
	Apr. 30, 2019	Apr. 30, 2018
Income Tax Disclosure [Abstract]
Income tax expense at statutory rate	$ 547	$ 2,864
State and local taxes, net of federal income tax benefit (expense)	(29)	162
Tax credits (state, net of federal benefit)	(546)	(370)
Effects of differing US and foreign tax rates	190	(97)
Rate reduction impact on deferred tax assets	75	680
Federal and state transition tax on unrepatriated foreign earnings	0	649
Effects of stock options exercised	(49)	0
Effect of prior year true ups	(105)	0
Impact of foreign subsidiary income to parent	317	0
Increase (decrease) in valuation allowance	7	175
Other items, net	39	98
Net income tax expense	$ 446	$ 4,161

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