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Segment Information (Details) - USD ($) $ in Thousands	3 Months Ended
	Jul. 31, 2020	Jul. 31, 2019
Segment Reporting Information [Line Items]
Revenues from external customers	$ 36,423	$ 39,336
Intersegment revenues	0	0
Earnings (loss) before income taxes	(587)	665
Corporate / Eliminations
Segment Reporting Information [Line Items]
Revenues from external customers	0	0
Intersegment revenues	(1,462)	(3,021)
Earnings (loss) before income taxes	(1,715)	(1,503)
Domestic Operations | Operating Segments
Segment Reporting Information [Line Items]
Revenues from external customers	30,058	29,287
Intersegment revenues	651	2,179
Earnings (loss) before income taxes	993	1,560
International Operations | Operating Segments
Segment Reporting Information [Line Items]
Revenues from external customers	6,365	10,049
Intersegment revenues	811	842
Earnings (loss) before income taxes	$ 135	$ 608

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