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Segment Information (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Oct. 31, 2020
Oct. 31, 2019
Oct. 31, 2020
Oct. 31, 2019
Segment Reporting Information [Line Items]        
Net sales $ 39,000 $ 39,722 $ 75,423 $ 79,058
Intersegment revenues 0 0 0 0
Earnings (loss) before income taxes (362) (158) (949) 507
Corporate / Eliminations        
Segment Reporting Information [Line Items]        
Net sales 0 0 0 0
Intersegment revenues (1,700) (1,548) (3,162) (4,569)
Earnings (loss) before income taxes (1,743) (1,405) (3,458) (2,908)
Domestic Operations | Operating Segments        
Segment Reporting Information [Line Items]        
Net sales 28,772 31,584 58,830 60,871
Intersegment revenues 601 907 1,252 3,086
Earnings (loss) before income taxes 595 746 1,588 2,306
International Operations | Operating Segments        
Segment Reporting Information [Line Items]        
Net sales 10,228 8,138 16,593 18,187
Intersegment revenues 1,099 641 1,910 1,483
Earnings (loss) before income taxes $ 786 $ 501 $ 921 $ 1,109