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Segment Information (Details) - USD ($) $ in Thousands	3 Months Ended
	Jul. 31, 2019	Jul. 31, 2018
Segment Reporting Information [Line Items]
Revenues from external customers	$ 39,336	$ 42,152
Intersegment revenues	0	0
Earnings (loss) before income taxes	665	1,893
Corporate / Eliminations
Segment Reporting Information [Line Items]
Revenues from external customers	0	0
Intersegment revenues	(3,021)	(1,188)
Earnings (loss) before income taxes	(1,503)	(1,664)
Domestic Operations | Operating Segments
Segment Reporting Information [Line Items]
Revenues from external customers	29,287	36,070
Intersegment revenues	2,179	462
Earnings (loss) before income taxes	1,560	3,108
International Operations | Operating Segments
Segment Reporting Information [Line Items]
Revenues from external customers	10,049	6,082
Intersegment revenues	842	726
Earnings (loss) before income taxes	$ 608	$ 449

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