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Income Taxes - Schedule of Income Tax Reconciliation (Detail) - USD ($) $ in Thousands	12 Months Ended
	Apr. 30, 2022	Apr. 30, 2021
Income Tax Disclosure [Abstract]
Income tax benefit at statutory rate	$ (432)	$ (470)
State and local taxes, net of federal income tax benefit	(29)	(129)
Tax credits (state, net of federal benefit)	(457)	(415)
Effects of differing US and foreign tax rates	22	17
Tax on unrepatriated and repatriated foreign earnings	0	226
Net operating loss adjustment	(286)	118
Impact of foreign subsidiary income to parent	74	67
Increase in valuation allowance	4,170	1,538
Other items, net	456	38
Net income tax expense	$ 3,518	$ 990

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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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