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Summary of significant accounting policies (Details Narrative) - shares
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2010
Jun. 30, 2010
Earnings per share [line items]        
Shares Issued       20,000
Interest and fee income 8.70% 9.70%    
PRC [Member]        
Earnings per share [line items]        
Interest and fee income 6.00%      
Ordinary Shares [Member] | Top of Range [Member]        
Earnings per share [line items]        
Shares Issued     23,200,000