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Accrued Expenses - Schedule of Accrued Expenses (Details) - USD ($) $ in Thousands | Apr. 30, 2020 | Apr. 30, 2019
--- | --- | ---
Payables and Accruals [Abstract] |  |
Project costs | $ 48 | $ 9
Contract loss reserve | 216 | 211
Employee incentive payments |  | 580
Accrued salary and benefits | 483 | 500
Legal and accounting fees | 283 | 273
Accrued taxes payable | 177 | 177
Other | 146 | 188
Accrued expenses total | $ 1,353 | $ 1,938

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