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Income Taxes - Schedule of Income Tax Reconciliation (Detail) - USD ($)	12 Months Ended
	Apr. 30, 2024	Apr. 30, 2023
Income Tax Disclosure [Abstract]
Income tax expense at statutory rate	$ 2,755,000	$ 945,000
State and local taxes, net of federal income tax benefit	575,000	(119,000)
Tax credits	(355,000)	(433,000)
Effects of differing US and foreign tax rates	243,000	260,000
Effect of pension settlement	(3,870,000)	0
Return to provision adjustment	743,000	413,000
Impact of foreign subsidiary income to parent	96,000	99,000
Increase (decrease) in valuation allowance	(6,579,000)	1,667,000
Deferred taxes on unremitted earnings	371,000	406,000
Other items, net	83,000	(99,000)
Net income tax (benefit) expense	$ (5,938,000)	$ 3,139,000

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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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