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Condensed Consolidated Statements of Operations (Unaudited) (USD $)
In Thousands, except Per Share data, unless otherwise specified
 3 Months Ended
Mar. 29, 2014
Mar. 30, 2013
Total revenues $ 10,329 $ 8,939
Cost of revenues 5,274 4,708
Gross profit 5,055 4,231
Operating expenses:    
Research and development 1,194 996
Sales and marketing 1,748 1,625
General and administrative 1,516 1,186
Proceeds from demutualization of insurance carrier   (473)
Total operating expenses 4,458 3,334
Income from operations 597 897
Other expense, net 97 18
Income from operations before provision for income taxes 500 879
Provision for income taxes 13 5
Net income $ 487 $ 874
Net income per share:    
Basic $ 0.05 $ 0.10
Diluted $ 0.05 $ 0.09
Weighted average shares used in computing net income per common share    
Basic 9,963 8,511
Diluted 10,526 9,802