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Summary of significant accounting policies (Details Narrative) - CNY (¥)
¥ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2010
Statement [Line Items]        
Common stock, shares issued 269,252      
Intangible assets estimated useful life 5 years      
Net cash decreased ¥ 212 ¥ 3,500 ¥ 17,900  
Cash balances ¥ 97      
Ownership percentage description The Company has also acquired the financial support letter from Hubei New Nature Investment Co., Ltd, a company that is 80.8% owned by the Chairman and the Chief Executive Officer, Mr Ricky Qizhi Wei, and from Dunxin Holdings Co., Ltd, a company that is 70% owned by the Chairman and the Chief Executive Officer, Mr Ricky Qizhi Wei, which have expressed the willingness and intention to provide the necessary financial support to the Company.      
PRC [Member]        
Statement [Line Items]        
Interest and fee income 6.00%      
Equity Incentive Plan [member]        
Statement [Line Items]        
Common stock, shares issued 1,069,615 269,252   23,200,000