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Inventories (Details) (USD $)
Sep. 28, 2013
Dec. 29, 2012
Components of inventories [Abstract]    
Raw material and component parts $ 8,762,534 $ 8,473,007
Work in process 6,389,347 6,160,578
Finished goods 15,273,582 14,751,195
Inventories $ 30,425,463 $ 29,384,780