Condensed Consolidated Statements of Earnings (Unaudited) (USD $) In Thousands, except Per Share data	3 Months Ended		6 Months Ended
	Jul. 03, 2011	Jul. 04, 2010	Jul. 03, 2011	Jul. 04, 2010
Condensed Consolidated Statements of Earnings [Abstract]
Net sales	$ 146,919	$ 138,851	$ 298,437	$ 268,254
Costs and expenses:
Cost of goods sold	119,051	108,511	241,409	207,435
Selling, general and administrative expenses	18,057	18,283	36,429	37,832
Research and development expenses	4,590	4,316	9,619	8,899
Restructuring charge - Note M	694		694
Operating earnings	4,527	7,741	10,286	14,088
Other (expense)/income:
Interest expense	(511)	(228)	(1,003)	(463)
Interest income	276	81	472	134
Other	743	(337)	1,873	(821)
Total other income/(expense)	508	(484)	1,342	(1,150)
Earnings before income taxes	5,035	7,257	11,628	12,938
Income tax expense	903	1,365	2,380	2,615
Net earnings	$ 4,132	$ 5,892	$ 9,248	$ 10,323
Net earnings per share - Note J
Basic	$ 0.12	$ 0.17	$ 0.27	$ 0.30
Diluted	$ 0.12	$ 0.17	$ 0.26	$ 0.30
Cash dividends declared per share	$ 0.03	$ 0.03	$ 0.06	$ 0.06
Average common shares outstanding:
Basic	34,375	34,048	34,334	34,001
Diluted	35,025	34,874	35,050	34,811