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Pledged deposits (Narrative) (Details) - 3 months ended Mar. 31, 2018
USD ($)
CNY (¥)
Pledged Deposits 1 | $ $ 1,343,488  
Pledged Deposits 2 | ¥   ¥ 8,430,792
Pledged Deposits 3 | $ 1,000,000  
Pledged Deposits 4 | ¥   6,300,000
Pledged Deposits 5 | $ 32,626  
Pledged Deposits 6 | ¥   200,000
Pledged Deposits 7 | $ 300,000  
Pledged Deposits 8 | ¥   1,900,000
Pledged Deposits 9 | $ $ 1,343,488  
Pledged Deposits 10 | ¥   ¥ 8,430,792