CONSOLIDATED STATEMENTS OF NET INCOME (LOSS) - USD ($) shares in Thousands	3 Months Ended		9 Months Ended
	Jan. 30, 2022	Jan. 31, 2021	Jan. 30, 2022	Jan. 31, 2021
Income Statement [Abstract]
Net sales	$ 80,291,000	$ 79,341,000	$ 237,899,000	$ 220,656,000
Cost of sales	(71,181,000)	(65,469,000)	(205,563,000)	(182,621,000)
Gross profit	9,110,000	13,872,000	32,336,000	38,035,000
Selling, general and administrative expenses	(8,007,000)	(9,835,000)	(26,275,000)	(27,597,000)
Income from operations	1,103,000	4,037,000	6,061,000	10,438,000
Interest expense				(51,000)
Interest income	214,000	90,000	347,000	208,000
Other expense	(322,000)	(1,010,000)	(963,000)	(2,057,000)
Income before income taxes	995,000	3,117,000	5,445,000	8,538,000
Income tax expense	(1,284,000)	(899,000)	(2,633,000)	(6,836,000)
(Loss) income from investment in unconsolidated joint venture		(136,000)		31,000
Net (loss) income	$ (289,000)	$ 2,082,000	$ 2,812,000	$ 1,733,000
Net (loss) income per share - basic	$ (0.02)	$ 0.17	$ 0.23	$ 0.14
Net (loss) income per share - diluted	$ (0.02)	$ 0.17	$ 0.23	$ 0.14
Average shares outstanding, basic	12,212	12,305	12,249	12,297
Average shares outstanding, diluted	12,212	12,369	12,341	12,299