Condensed Consolidated Statements of Earnings (Unaudited) (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
Condensed Consolidated Statements of Earnings [Abstract]
Net sales	$ 146,070	$ 139,362	$ 444,507	$ 407,616
Costs and expenses:
Cost of goods sold	118,610	109,393	360,496	316,828
Insurance recovery for business interruption - fire	(1,113)		(1,892)
Selling, general and administrative expenses	18,343	17,112	55,074	54,944
Research and development expenses	5,163	5,086	14,782	13,985
Insurance recovery for property damage - fire	(2,687)		(2,687)
Restructuring charge - Note M			694
Operating earnings	7,754	7,771	18,040	21,859
Other (expense)/income:
Interest expense	(549)	(254)	(1,552)	(717)
Interest income	359	105	831	239
Other	(65)	1,738	1,808	917
Total other (expense)/income	(255)	1,589	1,087	439
Earnings before income taxes	7,499	9,360	19,127	22,298
Income tax expense	1,636	2,445	4,016	5,060
Net earnings	$ 5,863	$ 6,915	$ 15,111	$ 17,238
Net earnings per share - Note J
Basic	$ 0.17	$ 0.20	$ 0.44	$ 0.51
Diluted	$ 0.17	$ 0.20	$ 0.43	$ 0.50
Cash dividends declared per share	$ 0.03	$ 0.03	$ 0.09	$ 0.09
Average common shares outstanding:
Basic	34,375	34,181	34,347	34,060
Diluted	34,994	34,827	35,026	34,816