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Segment Information (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Oct. 31, 2021	Oct. 31, 2020	Oct. 31, 2021	Oct. 31, 2020
Segment Reporting Information [Line Items]
Net sales	$ 39,031	$ 39,000	$ 78,524	$ 75,423
Intersegment revenues	0	0	0	0
Earnings (loss) before income taxes	(2,887)	(362)	(3,943)	(949)
Corporate / Eliminations
Segment Reporting Information [Line Items]
Net sales	0	0	0	0
Intersegment revenues	(741)	(1,700)	(1,481)	(3,162)
Earnings (loss) before income taxes	(1,370)	(1,743)	(2,881)	(3,458)
Domestic Operations | Operating Segments
Segment Reporting Information [Line Items]
Net sales	29,934	28,772	59,597	58,830
Intersegment revenues	170	601	345	1,252
Earnings (loss) before income taxes	(2,095)	595	(2,304)	1,588
International Operations | Operating Segments
Segment Reporting Information [Line Items]
Net sales	9,097	10,228	18,927	16,593
Intersegment revenues	571	1,099	1,136	1,910
Earnings (loss) before income taxes	$ 578	$ 786	$ 1,242	$ 921

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