Segment Information (Details) - USD ($) $ in Thousands	3 Months Ended
	Jul. 31, 2022	Jul. 31, 2021
Segment Reporting Information [Line Items]
Net sales	$ 50,123	$ 39,493
Intersegment revenues	0	0
Earnings (loss) before income taxes	(340)	(1,056)
Corporate / Eliminations
Segment Reporting Information [Line Items]
Net sales	0	0
Intersegment revenues	(2,417)	(740)
Earnings (loss) before income taxes	(1,532)	(1,511)
Domestic Operations | Operating Segments
Segment Reporting Information [Line Items]
Net sales	37,468	29,663
Intersegment revenues	796	175
Earnings (loss) before income taxes	98	(209)
International Operations | Operating Segments
Segment Reporting Information [Line Items]
Net sales	12,655	9,830
Intersegment revenues	1,621	565
Earnings (loss) before income taxes	$ 1,094	$ 664