Consolidated Statements Of Earnings (USD $) In Thousands, except Per Share data	3 Months Ended		9 Months Ended
	Oct. 02, 2011	Oct. 03, 2010	Oct. 02, 2011	Oct. 03, 2010
Consolidated Statements Of Earnings [Abstract]
Net sales	$ 104,861	$ 113,547	$ 312,015	$ 337,022
Cost of sales	81,204	89,184	245,739	261,555
Gross profit	23,657	24,363	66,276	75,467
Selling and general expenses	4,403	4,237	13,512	12,070
Operating profit	19,254	20,126	52,764	63,397
Other income	264	570	1,289	1,959
Earnings before provision for income taxes	19,518	20,696	54,053	65,356
Income tax provision	7,132	7,483	19,487	23,969
Net earnings	$ 12,386	$ 13,213	$ 34,566	$ 41,387
Weighted average shares outstanding:
Basic	6,872	6,863	6,870	6,861
Diluted	6,875	6,865	6,873	6,862
Net earnings per share:
Basic	$ 1.80	$ 1.93	$ 5.03	$ 6.03
Diluted	$ 1.80	$ 1.92	$ 5.03	$ 6.03
Cash dividends declared and paid per common share			$ 8.25	$ 8.15