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Income Taxes - Schedule of Income Tax Reconciliation (Detail) - USD ($) $ in Thousands	12 Months Ended
	Apr. 30, 2021	Apr. 30, 2020
Income Tax Disclosure [Abstract]
Income tax benefit at statutory rate	$ (470)	$ (567)
State and local taxes, net of federal income tax benefit	(129)	(115)
Tax credits (state, net of federal benefit)	(415)	(477)
Effects of differing US and foreign tax rates	17	3
Rate reduction impact on deferred tax assets	0	(47)
Tax on unrepatriated and repatriated foreign earnings	226	1,964
Net operating loss carryback	118	(939)
Effect of prior year true ups	(42)	38
Impact of foreign subsidiary income (loss) to parent	67	(5)
Increase in valuation allowance	1,538	1,707
Other items, net	80	196
Net income tax expense	$ 990	$ 1,758

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Effective Income Tax Rate Reconciliation, Effect Of Change In Enacted Tax Rate On Deferred Tax Assets, Amount

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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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