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Cost of Sales (Details) (USD $)
3 Months Ended 9 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Sep. 30, 2013
Sep. 30, 2012
Summary of composition of cost of sales by principal        
Purchases     $ 994,700 $ 685,489
Total $ 444,211 $ 332,487 $ 994,700 $ 685,489