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Discontinued Operations (Details) |  |  | 12 Months Ended
--- | --- | --- | ---
Feb. 22, 2019 USD ($) | Jun. 29, 2018 USD ($) | Apr. 30, 2021 USD ($) | Apr. 30, 2020 USD ($) contract | Apr. 30, 2019 USD ($) | Apr. 30, 2018 USD ($)
Discontinued operations |  |  |  |  |  |
Amount of alleged damages | $ 6,500,000 |  |  |  |  |
Statement of operations |  |  |  |  |  |
Net loss from discontinued operations |  |  |  |  | $ (2,964,000) | $ (3,887,000)
(Loss) gain on sale of business, net of tax (benefit) expense of $(76) and $2,444 for the year ended April 30, 2020 and April 30, 2019, respectively |  |  |  | $ (265,000) | 8,490,000 |
Tax expense |  |  |  | (76,000) | 2,444,000 |
Net (loss) income from discontinued operations |  |  |  | (265,000) | 5,526,000 | (3,887,000)
EES Business | Disposed of by sale |  |  |  |  |  |
Discontinued operations |  |  |  |  |  |
Cash consideration received |  | $ 31,994,000 |  |  |  |
Gain on sale of business |  | 11,420,000 |  |  | (486,000) |
Working capital dispute |  | $ 922,000 |  |  |  |
EES Business | Disposed of by sale | Other income (expense) |  |  |  |  |  |
Statement of operations |  |  |  |  |  |
Net Sales |  |  |  | 551,000 | 2,758,000 |
EES Business | Discontinued Operations |  |  |  |  |  |
Statement of operations |  |  |  |  |  |
Net Sales |  |  |  |  | 4,256,000 | 38,411,000
Cost of sales |  |  |  |  | 5,097,000 | 33,384,000
Gross margin |  |  |  |  | (841,000) | 5,027,000
Selling, general and administrative |  |  |  |  | 1,515,000 | 7,825,000
Research and development |  |  |  |  | 1,072,000 | 3,526,000
Other (expense), net |  |  |  |  | (1,000) | (27,000)
Loss from discontinued operations before income taxes |  |  |  |  | (3,427,000) | (6,351,000)
Benefit for income taxes |  |  |  |  | (463,000) | (2,464,000)
Net loss from discontinued operations |  |  |  |  | (2,964,000) | (3,887,000)
(Loss) gain on sale of business, net of tax (benefit) expense of $(76) and $2,444 for the year ended April 30, 2020 and April 30, 2019, respectively |  |  | $ (265,000) |  | 8,490,000 |
Tax expense |  |  |  | (76,000) | 2,444,000 |
Net (loss) income from discontinued operations |  |  | $ (265,000) |  | $ 5,526,000 | $ (3,887,000)
Holdback | Disposed of by sale |  |  |  |  |  |
Discontinued operations |  |  |  |  |  |
Cash consideration received |  |  |  | $ 6,500,000 |  |
Number of remaining contracts | contract |  |  |  | 2 |  |

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