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Inventories (Details) (USD $)
Apr. 04, 2015
Jan. 03, 2015
Components of inventories [Abstract]    
Raw material and component parts $ 9,155,290us-gaap_InventoryRawMaterialsAndSuppliesNetOfReserves $ 9,219,341us-gaap_InventoryRawMaterialsAndSuppliesNetOfReserves
Work in process 7,037,276us-gaap_InventoryWorkInProcessNetOfReserves 7,074,950us-gaap_InventoryWorkInProcessNetOfReserves
Finished goods 17,968,966us-gaap_InventoryFinishedGoodsNetOfReserves 18,107,906us-gaap_InventoryFinishedGoodsNetOfReserves
Inventories $ 34,161,532us-gaap_InventoryNet $ 34,402,197us-gaap_InventoryNet