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Income Taxes - Reconciliation of Provision for Income Taxes from Continuing Operations (Detail) - USD ($) $ in Thousands | 12 Months Ended
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Apr. 30, 2026 | Apr. 30, 2025 | Apr. 30, 2024
Income Tax Disclosure [Abstract] |  |  |  |  |
Federal income taxes expected at the statutory rate |  | $ 5,265 |  | $ 4,041 | $ 10,861
State income taxes, net of federal tax effects |  | 189 | [1] | 1,406 | (144)
Foreign derived intangible income (FDII) deductions |  | (24) |  |  |
Nontaxable or nondeductible items |  | 441 |  |  |
Stock compensation |  |  |  | 386 | 467
Business meals and entertainment |  |  |  | 113 | 100
Research and development tax credit |  | (312) |  | (335) | (281)
Amendments to prior year returns |  |  |  | 0 | (1,176)
Deferral adjustment for stock compensation |  | 988 |  |  |
Other |  | 42 |  | 209 | 529
Total income tax expense |  | $ 6,589 |  | $ 5,820 | $ 10,356
U.S. Federal Statutory Tax Rate, Percent |  | 21.00% |  | 21.00% |
State income taxes, net of federal tax effects, Percent | [1] | 0.80% |  |  |
Foreign derived intangible income (FDII) deductions, Percent |  | (0.10%) |  |  |
Research & development and fuel, Percent |  | 1.20% |  |  |
Nontaxable or nondeductible items, Percent |  | 1.80% |  |  |
Deferral adjustment for stock compensation, Percent |  | 3.80% |  |  |
Other, Percent |  | 0.20% |  |  |
Total income tax expense, Percent |  | 26.30% |  |  |
[1] | State taxes in California, Louisiana, Minnesota, North Carolina, and Texas make up the majority (greater than 50%) of the tax effect in this category.

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