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Segment Information (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Oct. 31, 2019 | Oct. 31, 2018 | Oct. 31, 2019 | Oct. 31, 2018
Segment Reporting Information [Line Items] |  |  |  |
Revenues from external customers | $ 39,722 | $ 37,278 | $ 79,058 | $ 79,430
Intersegment revenues | 0 | 0 | 0 | 0
Earnings (loss) before income taxes | (158) | 1,760 | 507 | 3,653
Corporate / Eliminations |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenues from external customers | 0 | 0 | 0 | 0
Intersegment revenues | (1,548) | (1,524) | (4,569) | (2,712)
Earnings (loss) before income taxes | (1,405) | (1,782) | (2,908) | (3,446)
Domestic Operations | Operating Segments |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenues from external customers | 31,584 | 30,622 | 60,871 | 66,692
Intersegment revenues | 907 | 416 | 3,086 | 878
Earnings (loss) before income taxes | 746 | 2,837 | 2,306 | 5,945
International Operations | Operating Segments |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenues from external customers | 8,138 | 6,656 | 18,187 | 12,738
Intersegment revenues | 641 | 1,108 | 1,483 | 1,834
Earnings (loss) before income taxes | $ 501 | $ 705 | $ 1,109 | $ 1,154

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