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Income Taxes - Schedule of Income Tax Reconciliation (Detail) - USD ($)
 12 Months Ended
Apr. 30, 2025
Apr. 30, 2024
Income Tax Disclosure [Abstract]    
Income tax expense at statutory rate $ 3,105,000 $ 2,755,000
State and local taxes, net of federal income tax benefit (168,000) 575,000
Tax credits (515,000) (355,000)
Effects of differing US and foreign tax rates 183,000 243,000
Non-deductible transaction costs 348,000 0
Effect of pension settlement 0 (3,870,000)
Return to provision adjustment (72,000) 743,000
Impact of foreign subsidiary income to parent 6,000 96,000
Increase (decrease) in valuation allowance 7,000 (6,579,000)
Deferred taxes on unremitted earnings 416,000 371,000
Other items, net (108,000) 83,000
Net income tax (benefit) expense $ 3,202,000 $ (5,938,000)