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Discontinued Operations (Tables) | 12 Months Ended
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Apr. 30, 2022
Discontinued Operations. |
Schedule of statements of operations data for the EES Business | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Year Ended April 30,
​ | ​ | 2022 | ​ | 2021 | ​ | 2020
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Net sales | ​ | $ | — | ​ | $ | — | ​ | $ | —
Cost of sales | ​ |  | — | ​ |  | — | ​ |  | —
Gross margin | ​ |  | — | ​ |  | — | ​ |  | —
Selling, general and administrative | ​ |  | — | ​ |  | — | ​ |  | —
Research and development | ​ |  | — | ​ |  | — | ​ |  | —
Other income, net | ​ | ​ | — | ​ | ​ | — | ​ | ​ | —
Loss from discontinued operations before income taxes | ​ |  | — | ​ |  | — | ​ |  | —
Benefit for income taxes | ​ | ​ | — | ​ | ​ | - | ​ | ​ | -
Net loss from discontinued operations | ​ | $ | — | ​ | $ | — | ​ | $ | —
Loss on sale of business, net of tax benefit of $76 for the year ended April 30, 2020 | ​ | ​ | — | ​ | ​ | — | ​ | ​ | (265)
Net loss from discontinued operations | ​ | $ | — | ​ | $ | — | ​ | $ | (265)

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