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Segment Information (Details) - USD ($) $ in Thousands	3 Months Ended
	Jul. 31, 2021	Jul. 31, 2020
Segment Reporting Information [Line Items]
Net sales	$ 39,493	$ 36,423
Intersegment revenues	0	0
Earnings (loss) before income taxes	(1,056)	(587)
Corporate / Eliminations
Segment Reporting Information [Line Items]
Net sales	0	0
Intersegment revenues	(740)	(1,462)
Earnings (loss) before income taxes	(1,511)	(1,715)
Domestic Operations | Operating Segments
Segment Reporting Information [Line Items]
Net sales	29,663	30,058
Intersegment revenues	175	651
Earnings (loss) before income taxes	(209)	993
International Operations | Operating Segments
Segment Reporting Information [Line Items]
Net sales	9,830	6,365
Intersegment revenues	565	811
Earnings (loss) before income taxes	$ 664	$ 135

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