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Accrued Liabilities | 12 Months Ended
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Apr. 30, 2025
Payables and Accruals [Abstract] |
Accounts Payable and Accrued Liabilities Disclosure [Text Block] | 8. Accrued Liabilities Accrued liabilities at April 30, 2025 and 2024, respectively, consisted of the following (in thousands):
|  | 2025 |  |  | 2024 |
Vacation and other compensation |  | $ | 1,575 |  |  | $ | 1,519 |
Incentive compensation |  |  | 1,347 |  |  |  | 978 |
Payroll taxes |  |  | 712 |  |  |  | 370 |
Warranty reserve |  |  | 567 |  |  |  | 542 |
Commissions |  |  | 24 |  |  |  | 85 |
Deferred compensation payable |  |  | 634 |  |  |  | 600 |
Other |  |  | 1,040 |  |  |  | 671 |
|  | $ | 5,899 |  |  | $ | 4,765 |

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