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Costs and Estimated Earnings in Excess of Billings (Details) - Contracts Accounted for under Percentage of Completion [Member] - USD ($)	12 Months Ended
	Apr. 30, 2020	Apr. 30, 2019
Costs and Estimated Earnings in Excess of Billings (Details) [Line Items]
Revenues	$ 38,000,000	$ 45,300,000
Anticipated Loss on Contracts	$ 2,400,000	$ 136,000

X

- Definition

Anticipated losses recognized in the current period on contracts which are expected to generate losses, which are probable and can be reasonably estimated, in a future period.

+ References

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- Definition

Amount of revenue recognized from goods sold, services rendered, insurance premiums, or other activities that constitute an earning process. Includes, but is not limited to, investment and interest income before deduction of interest expense when recognized as a component of revenue, and sales and trading gain (loss).

+ References

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