Consolidated Condensed Statements of Operations and Retained Earnings (Unaudited) (USD $) In Thousands, except Per Share data	3 Months Ended		9 Months Ended
	Oct. 01, 2011	Oct. 02, 2010	Oct. 01, 2011	Oct. 02, 2010
Consolidated Condensed Statements of Operations and Retained Earnings [Abstract]
Sales	$ 56,404	$ 49,906	$ 167,007	$ 143,931
Costs and Expenses:
Cost of products sold	42,149	37,013	123,860	108,807
Gross Profit	14,255	12,893	43,147	35,124
Selling, general and administrative expenses	6,360	5,679	19,849	17,183
Income from operations	7,895	7,214	23,298	17,941
Interest expense, net of interest income of $96 and $24 for the nine months and $82 and $7 for the three months ended 2011 and 2010, respectively	390	641	1,461	1,962
Income Before Income Taxes	7,505	6,573	21,837	15,979
Provision for Income Taxes	840	1,926	5,415	5,502
Net Income	6,665	4,647	16,422	10,477
Retained Earnings:
Beginning of period			65,047	50,099
End of period	$ 81,469	$ 60,576	$ 81,469	$ 60,576
Earnings per share:
Basic	$ 0.55	$ 0.39	$ 1.36	$ 0.88
Diluted	$ 0.52	$ 0.37	$ 1.28	$ 0.85
Average Common Shares Outstanding:
Basic	12,125	11,895	12,104	11,885
Diluted	12,926	12,474	12,863	12,318