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Segment Information (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Oct. 31, 2021 | Oct. 31, 2020 | Oct. 31, 2021 | Oct. 31, 2020
Segment Reporting Information [Line Items] |  |  |  |
Net sales | $ 39,031 | $ 39,000 | $ 78,524 | $ 75,423
Intersegment revenues | 0 | 0 | 0 | 0
Earnings (loss) before income taxes | (2,887) | (362) | (3,943) | (949)
Corporate / Eliminations |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Net sales | 0 | 0 | 0 | 0
Intersegment revenues | (741) | (1,700) | (1,481) | (3,162)
Earnings (loss) before income taxes | (1,370) | (1,743) | (2,881) | (3,458)
Domestic Operations | Operating Segments |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Net sales | 29,934 | 28,772 | 59,597 | 58,830
Intersegment revenues | 170 | 601 | 345 | 1,252
Earnings (loss) before income taxes | (2,095) | 595 | (2,304) | 1,588
International Operations | Operating Segments |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Net sales | 9,097 | 10,228 | 18,927 | 16,593
Intersegment revenues | 571 | 1,099 | 1,136 | 1,910
Earnings (loss) before income taxes | $ 578 | $ 786 | $ 1,242 | $ 921

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