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Cost of Sales (Details) (USD $)
9 Months Ended 12 Months Ended
Sep. 30, 2012
Sep. 30, 2011
Dec. 31, 2011
Dec. 31, 2010
Composition of cost of sales by principal        
Beginning inventory of trade goods           
Purchases 685,489 1,024,118    
Ending inventory of trade goods (-)            
Total $ 685,489 $ 1,024,118 $ (1,341,374) $ (2,502,037)