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Segment Information (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Jan. 31, 2021 | Jan. 31, 2020 | Jan. 31, 2021 | Jan. 31, 2020
Segment Reporting Information [Line Items] |  |  |  |
Net sales | $ 33,339 | $ 34,225 | $ 108,762 | $ 113,283
Intersegment revenues | 0 | 0 | 0 | 0
Earnings (loss) before income taxes | (718) | (2,251) | (1,667) | (1,744)
Corporate / Eliminations |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Net sales | 0 | 0 | 0 | 0
Intersegment revenues | (1,013) | (961) | (4,175) | (5,530)
Earnings (loss) before income taxes | (1,613) | (1,897) | (5,071) | (4,805)
Domestic Operations | Operating Segments |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Net sales | 25,066 | 26,699 | 83,896 | 87,570
Intersegment revenues | 463 | 302 | 1,715 | 3,388
Earnings (loss) before income taxes | 206 | (867) | 1,794 | 1,439
International Operations | Operating Segments |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Net sales | 8,273 | 7,526 | 24,866 | 25,713
Intersegment revenues | 550 | 659 | 2,460 | 2,142
Earnings (loss) before income taxes | $ 689 | $ 513 | $ 1,610 | $ 1,622

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