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Segment Information (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Jan. 31, 2024	Jan. 31, 2023	Jan. 31, 2024	Jan. 31, 2023
Segment Reporting Information [Line Items]
Net sales	$ 46,778	$ 60,821	$ 147,053	$ 165,508
Intersegment revenues	0	0	0	0
Earnings (loss) before income taxes	3,515	2,060	11,772	2,176
Corporate / Eliminations
Segment Reporting Information [Line Items]
Net sales	0	0	0	0
Intersegment revenues	(1,496)	(3,510)	(3,737)	(9,912)
Earnings (loss) before income taxes	(1,069)	(1,144)	(3,316)	(4,567)
Domestic Operations | Operating Segments
Segment Reporting Information [Line Items]
Net sales	31,774	36,134	101,379	111,593
Intersegment revenues	84	52	509	1,498
Earnings (loss) before income taxes	2,852	417	10,762	1,006
International Operations | Operating Segments
Segment Reporting Information [Line Items]
Net sales	15,004	24,687	45,674	53,915
Intersegment revenues	1,412	3,458	3,228	8,414
Earnings (loss) before income taxes	$ 1,732	$ 2,787	$ 4,326	$ 5,737

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