CONSOLIDATED STATEMENTS OF NET INCOME (LOSS) - USD ($) shares in Thousands	3 Months Ended
	Aug. 01, 2021	Aug. 02, 2020
Income Statement [Abstract]
Net sales	$ 83,047,000	$ 64,464,000
Cost of sales	(70,548,000)	(54,563,000)
Gross profit	12,499,000	9,901,000
Selling, general and administrative expenses	(9,181,000)	(8,018,000)
Income from operations	3,318,000	1,883,000
Interest expense		(51,000)
Interest income	74,000	58,000
Other expense	(237,000)	(366,000)
Income before income taxes	3,155,000	1,524,000
Income tax expense	(905,000)	(4,324,000)
Income from investment in unconsolidated joint venture		67,000
Net income (loss)	$ 2,250,000	$ (2,733,000)
Net income (loss) per share - basic	$ 0.18	$ (0.22)
Net income (loss) per share - diluted	$ 0.18	$ (0.22)
Average shares outstanding, basic	12,313	12,287
Average shares outstanding, diluted	12,415	12,287