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Inventories (Details) (USD $)
Jun. 29, 2013
Dec. 29, 2012
Components of inventories [Abstract]    
Raw material and component parts $ 8,544,552 $ 8,473,007
Work in process 6,230,402 6,160,578
Finished goods 14,893,629 14,751,195
Inventories $ 29,668,583 $ 29,384,780