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Discontinued Operations (Tables) | 12 Months Ended
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Apr. 30, 2021
Discontinued Operations. |
Schedule of statements of operations data for the EES Business | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Year Ended April 30,
​ | ​ | 2021 | ​ | 2020 | ​ | 2019
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Net sales | ​ | $ | — | ​ | $ | — | ​ | $ | 4,256
Cost of sales | ​ |  | — | ​ |  | — | ​ |  | 5,097
Gross margin | ​ |  | — | ​ |  | — | ​ |  | (841)
Selling, general and administrative | ​ |  | — | ​ |  | — | ​ |  | 1,515
Research and development | ​ |  | — | ​ |  | — | ​ |  | 1,072
Other income, net | ​ | ​ | — | ​ | ​ | — | ​ | ​ | 1
Loss from discontinued operations before income taxes | ​ |  | — | ​ |  | — | ​ |  | (3,427)
Benefit for income taxes | ​ | ​ | — | ​ | ​ | - | ​ | ​ | (463)
Net loss from discontinued operations | ​ | $ | — | ​ | $ | — | ​ | $ | (2,964)
(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) | ​ | ​ | 8,490
Net (loss) income from discontinued operations | ​ | $ | — | ​ | $ | (265) | ​ | $ | 5,526

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