Condensed Consolidated Statements of Income (Unaudited) (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended		6 Months Ended
	Sep. 28, 2014	Sep. 29, 2013	Sep. 28, 2014	Sep. 29, 2013
Income Statement [Abstract]
Sales	$ 88,881	$ 86,599	$ 186,917	$ 181,343
Cost of sales	(70,759)	(70,029)	(150,299)	(147,542)
Gross profit	18,122	16,570	36,618	33,801
Selling, general and administrative expenses	(8,271)	(8,293)	(17,146)	(17,263)
Operating income	9,851	8,277	19,472	16,538
Interest expense, net	(18)	(12)	(4)	(27)
Income before income taxes	9,833	8,265	19,468	16,511
Income tax provision	(3,686)	(3,058)	(7,300)	(6,192)
Net income	$ 6,147	$ 5,207	$ 12,168	$ 10,319
Weighted average number of shares outstanding - basic	10,558,173	10,545,719	10,564,107	10,533,951
Weighted average number of shares outstanding - diluted	10,603,931	10,588,747	10,616,874	10,582,318
Basic earnings per share
Basic earnings per share (usd per share)	$ 0.58	$ 0.49	$ 1.15	$ 0.98
Diluted earnings per share
Diluted earnings per share (usd per share)	$ 0.58	$ 0.49	$ 1.15	$ 0.98
Cash dividends declared per common share (usd per share)	$ 0.38	$ 0.36	$ 0.38	$ 0.36