Consolidated Statements of Operations (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended
	Mar. 29, 2014	Mar. 30, 2013
SALES
Product	$ 59,822	$ 52,482
Service	13,552	12,888
Total sales	73,374	65,370
COST OF SALES
Product	25,153	21,339
Service	8,138	7,206
Total cost of sales (exclusive of depreciation and amortization, shown separately below)	33,291	28,545
GROSS PROFIT	40,083	36,825
OPERATING EXPENSES:
Selling	17,433	16,650
General and administrative	8,413	7,515
Depreciation and amortization	1,847	1,833
Research and development	5,430	5,125
Total operating expenses	33,123	31,123
INCOME FROM OPERATIONS	6,960	5,702
OTHER (INCOME) EXPENSE
Interest income	(17)	(16)
Other expense, net	160	115
Interest expense		1
INCOME (LOSS) BEFORE INCOME TAX EXPENSE	6,817	5,602
Income tax expense	1,841	1,028
NET INCOME	$ 4,976	$ 4,574
NET INCOME PER SHARE - BASIC	$ 0.29	$ 0.27
NET INCOME PER SHARE - DILUTED	$ 0.29	$ 0.27
Weighted average shares - Basic	17,205,892	17,009,773
Weighted average shares - Diluted	17,364,373	17,176,876