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CONDENSED CONSOLIDATED STATEMENTS OF INCOME (USD $)
In Thousands, except Per Share data, unless otherwise specified
 3 Months Ended
Mar. 30, 2012
Apr. 01, 2011
Net sales $ 15,509 $ 14,849
Cost of sales 4,607 5,220
Gross profit 10,902 9,629
General and administrative 3,860 3,397
Marketing and selling 4,663 4,459
Research and development 1,546 1,432
Other general and administrative expenses 555 133
Operating income 278 208
Other income (expense):    
Interest income   13
Interest expense (95) (153)
Gain on foreign currency transactions 67 372
Other income, net 214 163
Total other income, net 186 395
Income before provision for income taxes 464 603
Provision for income taxes 232 303
Net income $ 232 $ 300
Net income per share - basic $ 0.01 $ 0.01
Net income per share - diluted $ 0.01 $ 0.01
Weighted average shares outstanding - basic 36,071 35,188
Weighted average shares outstanding - diluted 38,420 36,389