CONSOLIDATED STATEMENTS OF NET INCOME (LOSS) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Jan. 31, 2021	Feb. 02, 2020	Jan. 31, 2021	Feb. 02, 2020
Income Statement [Abstract]
Net sales	$ 79,341	$ 68,518	$ 220,656	$ 208,787
Cost of sales	(65,469)	(56,998)	(182,621)	(171,329)
Gross profit from continuing operations	13,872	11,520	38,035	37,458
Selling, general and administrative expenses	(9,835)	(8,831)	(27,597)	(27,097)
Restructuring credit		35		70
Income from continuing operations	4,037	2,724	10,438	10,431
Interest expense			(51)	(21)
Interest income	90	258	208	776
Other expense	(1,010)	(282)	(2,057)	(476)
Income before income taxes from continuing operations	3,117	2,700	8,538	10,710
Income tax expense	(899)	(1,619)	(6,836)	(5,590)
Income (loss) from investment in unconsolidated joint venture	(136)	(56)	31	(59)
Net income from continuing operations	2,082	1,025	1,733	5,061
Loss before income taxes from discontinued operation		(7,824)		(8,886)
Income tax benefit		2,592		2,984
Net loss from discontinued operation		(5,232)		(5,902)
Net income (loss)	$ 2,082	$ (4,207)	$ 1,733	$ (841)
Net income from continuing operations per share - basic	$ 0.17	$ 0.08	$ 0.14	$ 0.41
Net income from continuing operations per share - diluted	0.17	0.08	0.14	0.41
Net loss from discontinued operation per share - basic		(0.42)		(0.48)
Net loss from discontinued operation per share - diluted		(0.42)		(0.48)
Net income (loss) per share - basic	0.17	(0.34)	0.14	(0.07)
Net income (loss) per share - diluted	$ 0.17	$ (0.34)	$ 0.14	$ (0.07)
Average shares outstanding, basic	12,305	12,409	12,297	12,405
Average shares outstanding, diluted	12,369	12,420	12,299	12,421