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Accrued Expenses (Tables) | 3 Months Ended
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Jul. 31, 2021
Payables and Accruals [Abstract] |
Schedule of Accrued Expenses | Accrued expenses consisted of the following at July 31, 2021 and April 30, 2021: Schedule of Accrued Expenses
|  | July 31, 2021 |  |  | April 30, 2021 |
|  | (in thousands) |  |  |  |
Project costs |  | $ | 198 |  |  | $ | 368 |
Contract loss reserve |  |  | 328 |  |  |  | 328 |
Employee incentive payments |  |  | 323 |  |  |  | 283 |
Accrued salary and benefits |  |  | 598 |  |  |  | 631 |
Legal and accounting fees |  |  | 292 |  |  |  | 200 |
Other |  |  | 82 |  |  |  | 71 |
Accrued expenses total |  | $ | 1,821 |  |  | $ | 1,881 |

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- Definition Tabular disclosure of the components of accrued liabilities. + References No definition available. + Details
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