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Income taxes - Pre-tax income (Details)
12 Months Ended
Dec. 31, 2019
USD ($)
Dec. 31, 2019
CNY (¥)
Dec. 31, 2018
CNY (¥)
Dec. 31, 2017
CNY (¥)
Income taxes [Line Items]        
Pre-tax income $ 95,365,488 ¥ 663,915,450 ¥ 1,084,922,919 ¥ 478,575,264
Cayman Islands        
Income taxes [Line Items]        
Pre-tax income (1,433,335) (9,978,594) (11,832,862) 86,909
Hong Kong        
Income taxes [Line Items]        
Pre-tax income (20,140) (140,208) (2,423,249) (17,470)
PRC        
Income taxes [Line Items]        
Pre-tax income $ 96,818,963 ¥ 674,034,252 ¥ 1,099,179,030 ¥ 478,505,825