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Costs and Estimated Earnings in Excess of Billings (Details) - Costs and Estimated Earnings in Excess of Billings, Net - USD ($) $ in Thousands | Apr. 30, 2020 | Apr. 30, 2019
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Costs and Estimated Earnings in Excess of Billings, Net [Abstract] |  |
Costs and estimated earnings in excess of billings | $ 10,460 | $ 8,278
Billings in excess of costs and estimated earnings | (3,507) | (1,608)
Net asset | $ 6,953 | $ 6,670

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