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Income Taxes - Schedule of Income Tax Reconciliation (Detail) - USD ($) | 12 Months Ended
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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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