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Income Taxes - Schedule of Income Tax Reconciliation (Detail) - USD ($) | 12 Months Ended
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Apr. 30, 2026 | Apr. 30, 2025
Income Tax Expense (Benefit), Effective Income Tax Rate Reconciliation, Amount [Abstract] |  |
Income tax expense at U.S. federal statutory rate | $ 2,884,000 | $ 3,105,000
State and local taxes, net of federal income tax benefit | 460,000 | (168,000)
Tax credits | (635,000) | (515,000)
Increase (decrease) in valuation allowance | 5,000 | 7,000
Nontaxable or nondeductible items |  |
Non-deductible transaction costs | 0 | 348,000
Other | 70,000 | 61,000
Return to provision adjustment | (130,000) | (72,000)
Other items, net | (34,000) | (169,000)
Net income tax (benefit) expense | $ 3,268,000 | $ 3,202,000
Effective Income Tax Rate Reconciliation, Percent [Abstract] |  |
Income tax expense at U.S. federal statutory rate | 21.00% | 21.00%
State and local taxes, net of federal income tax benefit | 3.30% | (1.10%)
Tax credits | (4.60%) | (3.50%)
Increase (decrease) in valuation allowance | 0.00% | 0.00%
Nontaxable or nondeductible items |  |
Non-deductible transaction costs | 0.00% | 2.40%
Other | 0.50% | 0.40%
Return to provision adjustment | (0.90%) | (0.50%)
Other items, net | (0.20%) | (1.10%)
Net income tax (benefit) expense | 23.80% | 21.70%
Foreign - India |  |
Income Tax Expense (Benefit), Effective Income Tax Rate Reconciliation, Amount [Abstract] |  |
Foreign tax effects | $ 285,000 | $ 190,000
Deferred taxes on unremitted foreign earnings ("APB 23") | 437,000 | 416,000
Cross-border tax laws | $ 21,000 | $ 6,000
Effective Income Tax Rate Reconciliation, Percent [Abstract] |  |
Foreign tax effects | 2.10% | 1.30%
Deferred taxes on unremitted foreign earnings ("APB 23") | 3.20% | 2.80%
Cross-border tax laws | 0.20% | 0.00%
Foreign - Other jurisdictions |  |
Income Tax Expense (Benefit), Effective Income Tax Rate Reconciliation, Amount [Abstract] |  |
Foreign tax effects | $ (95,000) | $ (7,000)
Effective Income Tax Rate Reconciliation, Percent [Abstract] |  |
Foreign tax effects | (0.70%) | 0.00%

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- Definition Amount of difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying statutory federal (national) tax rate to pretax income (loss) from continuing operation attributable to other reconciling item. Excludes state and local income tax expense (benefit), federal tax expense (benefit), statutory income tax expense (benefit) outside of country of domicile, tax credit, nondeductible expense, deduction, income tax settlement, income tax contingency, and cross-border tax law. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 740 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 12 -Subparagraph (b)(3) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482685/740-10-50-12 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 740 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 12 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482685/740-10-50-12 + Details
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