Consolidated Statements Of Comprehensive Income (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended
	Apr. 01, 2012	Apr. 03, 2011
Consolidated Statements Of Comprehensive Income [Abstract]
Net sales	$ 96,773	$ 108,886
Cost of sales	76,421	86,932
Gross profit	20,352	21,954
Selling and general expenses	5,714	4,815
Operating profit	14,638	17,139
Other income	113	540
Earnings before provision for income taxes	14,751	17,679
Income tax provision	5,407	6,316
Net earnings	9,344	11,363
Weighted average shares outstanding:
Basic	6,876	6,866
Diluted	6,878	6,867
Net earnings per share:
Basic	$ 1.36	$ 1.65
Diluted	$ 1.36	$ 1.65
Comprehensive income:
Net earnings	9,344	11,363
Other comprehensive income (loss), net of tax:
Unrealized gain (loss) on available-for-sale securities	4	(12)
Comprehensive income	$ 9,348	$ 11,351
Cash dividends declared and paid per common share	$ 6.00	$ 8.25