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Earnings per share (Details Narrative) - ¥ / shares
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Dec. 28, 2017
Dec. 18, 2014
Dec. 17, 2014
Earnings Per Share Details Narrative            
Weighted average number of shares outstanding in the year 236,180,071 227,716,692 227,716,692      
Common stock, ordinary shares       48 16 4
Common stock, par value           ¥ 0.00005