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Accrued Expenses - Schedule of Accrued Expenses (Details) - USD ($) $ in Thousands | Jan. 31, 2021 | Apr. 30, 2020
--- | --- | ---
Payables and Accruals [Abstract] |  |
Project costs | $ 95 | $ 48
Contract loss reserve | 425 | 216
Employee incentive payments | 407 |
Accrued salary and benefits | 831 | 483
Legal and accounting fees | 403 | 283
Accrued taxes payable |  | 177
Other | 179 | 146
Accrued expenses total | $ 2,340 | $ 1,353

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