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Note 5 - Segment Reporting - Net Sales and Property and Equipment (Details) - USD ($)
$ in Thousands
 3 Months Ended
Jul. 31, 2021
Aug. 01, 2020
Net sales $ 144,732 $ 143,644
Property and equipment, net of accumulated depreciation 56,208 58,682
UNITED STATES    
Net sales 123,482 128,069
Property and equipment, net of accumulated depreciation 48,450 50,130
Non-US [Member]    
Net sales 21,250 15,575
Property and equipment, net of accumulated depreciation $ 7,758 $ 8,552