Consolidated Statements Of Operations (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended
	Mar. 30, 2013	Mar. 31, 2012
SALES
Product	$ 52,482	$ 54,424
Service	12,888	10,805
Total Sales	65,370	65,229
COST OF SALES
Product	21,339	20,506
Service	7,206	7,537
Total Cost of Sales (exclusive of depreciation and amortization, shown separately below)	28,545	28,043
GROSS PROFIT	36,825	37,186
OPERATING EXPENSES:
Selling	16,650	16,038
General and administrative	7,515	6,628
Depreciation and amortization	1,833	1,679
Research and development	5,125	4,408
Total operating expenses	31,123	28,753
INCOME FROM OPERATIONS	5,702	8,433
OTHER (INCOME) EXPENSE
Interest income	(16)	(101)
Other expense (income), net	115	(140)
Interest expense	1	13
INCOME BEFORE INCOME TAX EXPENSE	5,602	8,661
INCOME TAX EXPENSE	1,028	1,911
NET INCOME	$ 4,574	$ 6,750
NET INCOME PER SHARE - BASIC	$ 0.27	$ 0.40
NET INCOME PER SHARE - DILUTED	$ 0.27	$ 0.39
Weighted average shares - Basic	17,009,773	16,788,241
Weighted average shares - Diluted	17,176,876	17,162,959