Condensed Consolidated Statements of Income (Unaudited) (USD $) In Thousands, except Share data	3 Months Ended		6 Months Ended
	Oct. 02, 2011	Sep. 30, 2010	Oct. 02, 2011	Sep. 30, 2010
Condensed Consolidated Statements of Income [Abstract]
Sales	$ 87,870	$ 70,398	$ 176,464	$ 145,064
Cost of sales	(69,120)	(52,656)	(139,787)	(108,874)
Gross profit	18,750	17,742	36,677	36,190
Selling, general and administrative expenses	(7,844)	(6,814)	(15,701)	(13,475)
Operating income	10,906	10,928	20,976	22,715
Investment income	28	96	93	201
Income from continuing operations before income taxes	10,934	11,024	21,069	22,916
Provision for income taxes	(4,217)	(4,192)	(7,998)	(8,747)
Income from continuing operations	6,717	6,832	13,071	14,169
Income from discontinued operations, net of tax	184		557
Net income	$ 6,901	$ 6,832	$ 13,628	$ 14,169
Weighted average number of shares outstanding-basic	10,322,768	10,257,175	10,314,973	10,255,297
Weighted average number of shares outstanding-diluted	10,365,372	10,332,764	10,362,847	10,321,355
Basic earnings per share
Earnings per share from continuing operations	$ 0.65	$ 0.67	$ 1.27	$ 1.38
Earnings per share from discontinued operations	$ 0.02		$ 0.05
Basic earnings per share	$ 0.67	$ 0.67	$ 1.32	$ 1.38
Diluted earnings per share
Earnings per share from continuing operations	$ 0.65	$ 0.66	$ 1.27	$ 1.37
Earnings per share from discontinued operations	$ 0.02		$ 0.05
Diluted earnings per share	$ 0.67	$ 0.66	$ 1.32	$ 1.37
Cash dividends declared per common share	$ 0.32	$ 0.40	$ 0.32	$ 0.40