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Segment Information (Details) - USD ($) $ in Thousands | 3 Months Ended
--- | ---
Jul. 31, 2021 | Jul. 31, 2020
Segment Reporting Information [Line Items] |  |
Net sales | $ 39,493 | $ 36,423
Intersegment revenues | 0 | 0
Earnings (loss) before income taxes | (1,056) | (587)
Corporate / Eliminations |  |
Segment Reporting Information [Line Items] |  |
Net sales | 0 | 0
Intersegment revenues | (740) | (1,462)
Earnings (loss) before income taxes | (1,511) | (1,715)
Domestic Operations | Operating Segments |  |
Segment Reporting Information [Line Items] |  |
Net sales | 29,663 | 30,058
Intersegment revenues | 175 | 651
Earnings (loss) before income taxes | (209) | 993
International Operations | Operating Segments |  |
Segment Reporting Information [Line Items] |  |
Net sales | 9,830 | 6,365
Intersegment revenues | 565 | 811
Earnings (loss) before income taxes | $ 664 | $ 135

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