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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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