Condensed Consolidated Statements of Income (Unaudited) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Sep. 27, 2020	Sep. 29, 2019	Sep. 27, 2020	Sep. 29, 2019
Income Statement [Abstract]
Sales	$ 147,801	$ 140,043	$ 290,973	$ 287,379
Cost of sales	(115,004)	(112,049)	(227,200)	(230,588)
Gross profit	32,797	27,994	63,773	56,791
Selling, general and administrative expenses	(16,221)	(14,817)	(31,259)	(29,653)
Operating income	16,576	13,177	32,514	27,138
Interest expense, net	(339)	(666)	(719)	(1,429)
Other income	327	26	804	143
Income before income taxes	16,564	12,537	32,599	25,852
Income tax expense	(4,374)	(3,287)	(8,621)	(6,795)
Net income	$ 12,190	$ 9,250	$ 23,978	$ 19,057
Weighted average number of shares outstanding - basic	10,527,891	10,575,538	10,526,511	10,589,922
Weighted average number of shares outstanding - diluted	10,622,881	10,633,117	10,634,281	10,663,864
Basic earnings per share
Basic earnings per share	$ 1.16	$ 0.87	$ 2.28	$ 1.80
Diluted earnings per share
Diluted earnings per share	1.15	0.87	2.25	1.79
Cash dividends declared per common share	$ 0.2325	$ 0.23	$ 0.465	$ 0.46