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Intangible assets (Details)
12 Months Ended
Dec. 31, 2019
USD ($)
Dec. 31, 2019
CNY (¥)
Dec. 31, 2018
CNY (¥)
Dec. 31, 2017
CNY (¥)
Dec. 31, 2019
CNY (¥)
Intangible assets          
Accumulated amortization $ (401,818)   ¥ (1,962,489)   ¥ (2,797,373)
Intangible assets, net 5,045,635   28,400,406   35,126,704
Insurance broker license 86,185 ¥ 600,000 26,000,000    
Amortization expenses 119,924 ¥ 834,884 389,829 ¥ 678,692  
Future amortization expenses          
2020 173,353       1,206,846
2021 138,366       963,277
2022 130,279       906,974
2023 127,583       888,206
2024 127,583       888,206
License          
Intangible assets          
Intangible assets, Gross 3,820,851   26,000,000   26,600,000
Software and others          
Intangible assets          
Intangible assets, Gross $ 1,626,602   ¥ 4,362,895   ¥ 11,324,077