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Variable Interest Entity (Details Textual)
Dec. 04, 2017
Jun. 08, 2017
Shanxi Xifeng Investment Co., Ltd. [Member]    
Variable Interest Entity (Textual)    
Percentage of equity interest 4.0625%  
Shanghai Dianniu [Member] | Minimum [Member]    
Variable Interest Entity (Textual)    
Percentage of equity interest   89.20%
Shanghai Dianniu [Member] | Maximum [Member]    
Variable Interest Entity (Textual)    
Percentage of equity interest   93.20%