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Segment Information (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Jan. 31, 2021	Jan. 31, 2020	Jan. 31, 2021	Jan. 31, 2020
Segment Reporting Information [Line Items]
Net sales	$ 33,339	$ 34,225	$ 108,762	$ 113,283
Intersegment revenues	0	0	0	0
Earnings (loss) before income taxes	(718)	(2,251)	(1,667)	(1,744)
Corporate / Eliminations
Segment Reporting Information [Line Items]
Net sales	0	0	0	0
Intersegment revenues	(1,013)	(961)	(4,175)	(5,530)
Earnings (loss) before income taxes	(1,613)	(1,897)	(5,071)	(4,805)
Domestic Operations | Operating Segments
Segment Reporting Information [Line Items]
Net sales	25,066	26,699	83,896	87,570
Intersegment revenues	463	302	1,715	3,388
Earnings (loss) before income taxes	206	(867)	1,794	1,439
International Operations | Operating Segments
Segment Reporting Information [Line Items]
Net sales	8,273	7,526	24,866	25,713
Intersegment revenues	550	659	2,460	2,142
Earnings (loss) before income taxes	$ 689	$ 513	$ 1,610	$ 1,622

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