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Inventories (Details) (USD $)
Dec. 31, 2014
Dec. 31, 2013
Components of inventories    
Raw materials $ 835,589us-gaap_InventoryRawMaterials $ 1,627,784us-gaap_InventoryRawMaterials
Work-in-process 1,454,999us-gaap_InventoryWorkInProcess 1,778,650us-gaap_InventoryWorkInProcess
Finished goods 2,132,080us-gaap_InventoryFinishedGoods 1,509,606us-gaap_InventoryFinishedGoods
Inventory gross 4,422,668us-gaap_InventoryGross 4,916,040us-gaap_InventoryGross
Less: reserve for obsolete inventory (181,646)us-gaap_InventoryValuationReserves (182,482)us-gaap_InventoryValuationReserves
Inventory net $ 4,241,022us-gaap_InventoryNet $ 4,733,558us-gaap_InventoryNet