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Schedule of Accrued Expenses (Details) - USD ($) $ in Thousands | Oct. 31, 2021 | Apr. 30, 2021
--- | --- | ---
Payables and Accruals [Abstract] |  |
Project costs | $ 257 | $ 368
Contract loss reserve | 328 | 328
Employee incentive payments | 275 | 283
Accrued salary and benefits | 426 | 631
Professional fees | 241 | 200
Other | 49 | 71
Accrued expenses total | $ 1,576 | $ 1,881

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