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Accrued Expenses - Schedule of Accrued Expenses (Details) - USD ($) $ in Thousands | Oct. 31, 2020 | Apr. 30, 2020
--- | --- | ---
Payables and Accruals [Abstract] |  |
Project costs | $ 142 | $ 48
Contract loss reserve | 280 | 216
Employee incentive payments | 526 |
Accrued salary and benefits | 499 | 483
Legal and accounting fees | 324 | 283
Accrued taxes payable | 326 | 177
Other | 118 | 146
Accrued expenses total | $ 2,215 | $ 1,353

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