Condensed Consolidated Statements of Income (Unaudited) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Sep. 27, 2015	Sep. 28, 2014	Sep. 27, 2015	Sep. 28, 2014
Income Statement [Abstract]
Sales	$ 94,592	$ 88,881	$ 196,088	$ 186,917
Cost of sales	(74,781)	(70,759)	(155,542)	(150,299)
Gross profit	19,811	18,122	40,546	36,618
Selling, general and administrative expenses	(10,303)	(8,271)	(20,194)	(17,146)
Operating income	9,508	9,851	20,352	19,472
Interest (expense) income, net	(15)	(18)	6	(4)
Income before income taxes	9,493	9,833	20,358	19,468
Income tax provision	(3,815)	(3,686)	(7,889)	(7,300)
Net income	$ 5,678	$ 6,147	$ 12,469	$ 12,168
Weighted average number of shares outstanding - basic	10,545,992	10,558,173	10,563,267	10,564,107
Weighted average number of shares outstanding - diluted	10,589,824	10,603,931	10,614,484	10,616,874
Basic earnings per share
Basic earnings per share	$ 0.54	$ 0.58	$ 1.18	$ 1.15
Diluted earnings per share
Diluted earnings per share	0.54	0.58	1.17	1.15
Cash dividends declared per common share	$ 0.4	$ 0.38	$ 0.4	$ 0.38