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Inventories (Details) (USD $)
Jun. 28, 2014
Dec. 28, 2013
Components of inventories [Abstract]    
Raw material and component parts $ 8,282,498 $ 8,256,977
Work in process 4,957,183 4,925,001
Finished goods 17,550,275 17,475,634
Inventories $ 30,789,956 $ 30,657,612