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Pledged deposits (Narrative) (Details) - 9 months ended Sep. 30, 2017
USD ($)
CNY (¥)
Pledged Deposits 1 | $ $ 1,266,850  
Pledged Deposits 2 | ¥   ¥ 8,430,792
Pledged Deposits 3 | $ 900,000  
Pledged Deposits 4 | ¥   6,300,000
Pledged Deposits 5 | $ 30,766  
Pledged Deposits 6 | ¥   200,000
Pledged Deposits 7 | $ 300,000  
Pledged Deposits 8 | ¥   1,900,000
Pledged Deposits 9 | $ $ 1,266,855  
Pledged Deposits 10 | ¥   ¥ 8,430,792