Condensed Consolidated Statements Of Income (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 29, 2012	Oct. 01, 2011	Sep. 29, 2012	Oct. 01, 2011
Condensed Consolidated Statements Of Income [Abstract]
Net sales	$ 43,396	$ 43,809	$ 134,149	$ 131,359
Cost of goods sold	20,249	20,300	59,618	57,288
Gross Profit	23,147	23,509	74,531	74,071
Selling, general and administrative expenses	17,699	17,396	55,528	56,069
Service and distribution costs	2,123	2,325	6,338	6,020
Research and development expenses	679	746	2,055	2,024
Operating Income	2,646	3,042	10,610	9,958
Interest income	4	3	14	9
Interest expense	(140)	(168)	(453)	(555)
Other expense	(11)	(492)	(119)	(464)
Interest and Other Expense	(147)	(657)	(558)	(1,010)
Income Before Income Taxes	2,499	2,385	10,052	8,948
Income tax provision	460	440	2,814	2,579
Net Income	$ 2,039	$ 1,945	$ 7,238	$ 6,369
Net Income Per Share:
Basic	$ 0.16	$ 0.16	$ 0.59	$ 0.52
Diluted	$ 0.15	$ 0.15	$ 0.56	$ 0.49
Weighted Average Shares Outstanding:
Denominator for Basic Net Income Per Share	12,729	12,244	12,357	12,183
Effect of dilutive securities	597	796	621	792
Denominator for Diluted Net Income Per Share	13,326	13,040	12,978	12,975