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Organization and principal activities (Details Narrative)
¥ / shares in Units, $ / shares in Units, ¥ in Thousands, $ in Thousands
1 Months Ended 12 Months Ended
Dec. 28, 2017
CNY (¥)
¥ / shares
shares
Dec. 31, 2017
CNY (¥)
Dec. 31, 2017
USD ($)
Dec. 31, 2016
CNY (¥)
Jun. 30, 2010
$ / shares
Earnings per share [line items]          
Country of incorporation   Cayman Islands      
Date of incorporation   Jun. 24, 2010      
Share price | $ / shares         $ 0.00005
Registered capital   ¥ 325   ¥ 77  
Xiniya Holdings Limited [Member]          
Earnings per share [line items]          
Divestiture of business, consideration receivable in cash ¥ 228,000,000        
True Silver Limited [Member]          
Earnings per share [line items]          
Country of incorporation   British Virgin Islands      
Business acquisition consideration paid in cash ¥ 228,000,000        
Registered capital | $     $ 50,000    
True Silver Limited [Member] | Ordinary Shares [Member]          
Earnings per share [line items]          
Business acquisition consideration paid, shares issued | shares 772,283,308        
Share price | ¥ / shares ¥ 1.00        
Hubei Chutian Microfinance Co., Ltd [Member]          
Earnings per share [line items]          
Country of incorporation   PRC      
Variable interest entity, ownership percentage hold by True Silver 80.00%        
Registered capital ¥ 450,000,000 ¥ 450,000,000      
Ownership interest held by the former shareholders 88.70%