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Geographic and Product Data (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 9 Months Ended
Sep. 28, 2012
Sep. 30, 2011
Sep. 28, 2012
Sep. 30, 2011
Net sales $ 15,866 $ 15,266 $ 47,316 $ 46,385
United States [Member]
       
Net sales 3,038 3,211 9,428 10,448
Japan [Member]
       
Net sales 4,237 4,037 12,187 11,772
Korea [Member]
       
Net sales 1,755 2,069 5,379 5,463
China [Member]
       
Net sales 2,444 1,825 6,691 4,832
Other [Member]
       
Net sales $ 4,392 $ 4,124 $ 13,631 $ 13,870