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INVENTORIES (Details) (USD $)
Mar. 28, 2015
Dec. 27, 2014
INVENTORIES    
Raw materials $ 27,830,262us-gaap_InventoryRawMaterialsNetOfReserves $ 15,880,826us-gaap_InventoryRawMaterialsNetOfReserves
Work-in-progress 5,121,540us-gaap_InventoryWorkInProcessNetOfReserves 3,136,994us-gaap_InventoryWorkInProcessNetOfReserves
Finished goods 6,175,896us-gaap_InventoryFinishedGoodsNetOfReserves 3,643,994us-gaap_InventoryFinishedGoodsNetOfReserves
Total $ 39,127,698us-gaap_InventoryNet $ 22,661,814us-gaap_InventoryNet