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Costs and Estimated Earnings in Excess of Billings (Tables) | 12 Months Ended
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Apr. 30, 2020
Contractors [Abstract] |
Costs and Estimated Earnings in Excess of Billings, Net [Table Text Block] | At April 30, 2020 and 2019, costs and estimated earnings in excess of billings, net, consisted of the following (in thousands):
|  | 2020 |  |  | 2019 |
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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