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INVENTORIES. (Details) (USD $)
Dec. 27, 2014
Dec. 28, 2013
INVENTORIES    
Raw materials $ 15,880,826us-gaap_InventoryRawMaterialsNetOfReserves $ 20,877,513us-gaap_InventoryRawMaterialsNetOfReserves
Work-in-progress 3,136,994us-gaap_InventoryWorkInProcessNetOfReserves 3,673,301us-gaap_InventoryWorkInProcessNetOfReserves
Finished goods 3,643,994us-gaap_InventoryFinishedGoodsNetOfReserves 7,945,441us-gaap_InventoryFinishedGoodsNetOfReserves
Total $ 22,661,814us-gaap_InventoryNet $ 32,496,255us-gaap_InventoryNet