Condensed Consolidated Statements Of Income (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2012	Jul. 02, 2011	Jun. 30, 2012	Jul. 02, 2011
Condensed Consolidated Statements Of Income [Abstract]
Net sales	$ 48,807	$ 47,768	$ 90,753	$ 87,550
Cost of goods sold	20,993	20,371	39,369	36,988
Gross Profit	27,814	27,397	51,384	50,562
Selling, general and administrative expenses	19,354	19,721	37,829	38,673
Service and distribution costs	2,167	2,116	4,215	3,695
Research and development expenses	716	707	1,376	1,278
Operating Income	5,577	4,853	7,964	6,916
Interest income	7	3	10	6
Interest expense	(155)	(160)	(313)	(387)
Other (expense) income	(131)	(6)	(108)	28
Interest and Other Expense	(279)	(163)	(411)	(353)
Income Before Income Taxes	5,298	4,690	7,553	6,563
Income tax provision	1,637	1,531	2,354	2,139
Net Income	$ 3,661	$ 3,159	$ 5,199	$ 4,424
Net Income Per Share:
Basic	$ 0.30	$ 0.26	$ 0.42	$ 0.36
Diluted	$ 0.28	$ 0.24	$ 0.40	$ 0.34
Weighted Average Shares Outstanding:
Denominator for Basic Net Income Per Share	12,397	12,191	12,343	12,153
Effect of dilutive securities	580	810	583	790
Denominator for Diluted Net Income Per Share	12,977	13,001	12,926	12,943