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Revolving line of credit (Details) (USD $)
Sep. 30, 2014
Dec. 31, 2013
Nov. 01, 2013
Revolving line of credit      
Revolving line of credit with a bank     $ 30,000,000
Annual interest rate     6.60%
Outstanding balance due under revolving line of credit (RMB 30,000,000) $ 4,875,353 $ 4,909,662