Condensed Consolidated Statements of Income (Unaudited) (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended		9 Months Ended
	Jan. 01, 2012	Dec. 31, 2010	Jan. 01, 2012	Dec. 31, 2010
Condensed Consolidated Statements of Income [Abstract]
Sales	$ 84,160	$ 70,620	$ 260,624	$ 215,684
Cost of sales	(68,481)	(56,894)	(208,268)	(165,768)
Gross profit	15,679	13,726	52,356	49,916
Selling, general and administrative expenses	(7,163)	(6,893)	(22,864)	(20,368)
Operating income	8,516	6,833	29,492	29,548
Investment income	26	71	119	272
Income from continuing operations before income taxes	8,542	6,904	29,611	29,820
Provision for income taxes	(3,257)	(2,650)	(11,255)	(11,397)
Income from continuing operations	5,285	4,254	18,356	18,423
Income from discontinued operations, net of tax	267		824
Net income	$ 5,552	$ 4,254	$ 19,180	$ 18,423
Weighted average number of shares outstanding-basic	10,332,480	10,259,458	10,320,810	10,256,674
Weighted average number of shares outstanding-diluted	10,410,533	10,355,888	10,403,711	10,336,169
Basic earnings per share
Earnings per share from continuing operations	$ 0.51	$ 0.41	$ 1.78	$ 1.80
Earnings per share from discontinued operations	$ 0.03		$ 0.08
Basic earnings per share	$ 0.54	$ 0.41	$ 1.86	$ 1.80
Diluted earnings per share
Earnings per share from continuing operations	$ 0.51	$ 0.41	$ 1.76	$ 1.78
Earnings per share from discontinued operations	$ 0.02		$ 0.08
Diluted earnings per share	$ 0.53	$ 0.41	$ 1.84	$ 1.78
Cash dividends declared per common share			$ 0.32	$ 0.40