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Segment Information (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Jan. 31, 2020 | Jan. 31, 2019 | Jan. 31, 2020 | Jan. 31, 2019
Segment Reporting Information [Line Items] |  |  |  |
Revenues from external customers | $ 34,225 | $ 32,372 | $ 113,283 | $ 111,802
Intersegment revenues | 0 | 0 | 0 | 0
Earnings (loss) before income taxes | (2,251) | 35 | (1,744) | 3,688
Corporate / Eliminations |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenues from external customers | 0 | 0 | 0 | 0
Intersegment revenues | (961) | (2,747) | (5,530) | (5,459)
Earnings (loss) before income taxes | (1,897) | (1,045) | (4,805) | (4,491)
Domestic Operations | Operating Segments |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenues from external customers | 26,699 | 25,217 | 87,570 | 91,909
Intersegment revenues | 302 | 612 | 3,388 | 1,490
Earnings (loss) before income taxes | (867) | 60 | 1,439 | 6,005
International Operations | Operating Segments |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenues from external customers | 7,526 | 7,155 | 25,713 | 19,893
Intersegment revenues | 659 | 2,135 | 2,142 | 3,969
Earnings (loss) before income taxes | $ 513 | $ 1,020 | $ 1,622 | $ 2,174

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