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Income Taxes - Schedule of Income Tax Reconciliation (Detail) - USD ($) $ in Thousands	12 Months Ended
	Apr. 30, 2023	Apr. 30, 2022
Income Tax Disclosure [Abstract]
Income tax expense (benefit) at statutory rate	$ 945	$ (432)
State and local taxes, net of federal income tax benefit	(119)	(29)
Tax credits (state, net of federal benefit)	(433)	(457)
Effects of differing US and foreign tax rates	260	22
Net operating loss adjustment	0	(286)
Return to provision adjustment	413	0
Impact of foreign subsidiary income to parent	99	74
Increase in valuation allowance	1,667	4,170
Other items, net	307	456
Net income tax expense	$ 3,139	$ 3,518

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Effective Income Tax Rate Reconciliation, Net Operating Loss Carryback, 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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