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Bank loans (Details) | 12 Months Ended |  |  |  |
--- | --- | --- | --- | --- | ---
Dec. 31, 2020 CNY (¥) | Dec. 31, 2020 USD ($) | Oct. 19, 2020 CNY (¥) | Mar. 27, 2020 CNY (¥) | Nov. 05, 2019 CNY (¥)
January 17, 2020 [Member] |  |  |  |  |
Bank loans (Details) [Line Items] |  |  |  |  |
Drawings amount | ¥ 20,000 |  |  |  |
Fixed interest rate, percentage | 5.28% | 5.28% |  |  |
April 18, 2020 [Member] |  |  |  |  |
Bank loans (Details) [Line Items] |  |  |  |  |
Drawings amount | ¥ 20,000 |  |  |  |
Fixed interest rate, percentage | 4.80% | 4.80% |  |  |
March 5, 2020 [Member] |  |  |  |  |
Bank loans (Details) [Line Items] |  |  |  |  |
Drawings amount | ¥ 2,000 |  |  |  |
Fixed interest rate, percentage | 4.90% | 4.90% |  |  |
October 27, 2021 [Member] |  |  |  |  |
Bank loans (Details) [Line Items] |  |  |  |  |
Drawings amount |  |  |  |  | ¥ 100,000
July 2, 2021 [Member] |  |  |  |  |
Bank loans (Details) [Line Items] |  |  |  |  |
Drawings amount | ¥ 9,900 |  |  |  |
Fixed interest rate, percentage | 5.00% | 5.00% |  |  |
March 27, 2020 [Member] |  |  |  |  |
Bank loans (Details) [Line Items] |  |  |  |  |
Drawings amount |  |  |  | ¥ 5,000 |
Fixed interest rate, percentage |  |  |  | 3.95% |
Repayment of bank debt | ¥ 800 |  |  |  |
October 19, 2020 [Member] |  |  |  |  |
Bank loans (Details) [Line Items] |  |  |  |  |
Drawings amount |  |  | ¥ 5,000 |  |
Fixed interest rate, percentage |  |  | 4.35% |  |
Repayment of bank debt | 300 |  |  |  |
Loan Agreement [Member] | July 2, 2021 [Member] |  |  |  |  |
Bank loans (Details) [Line Items] |  |  |  |  |
Drawings amount | 15,100 |  |  |  |
Mr. Zhao Jishuang [Member] |  |  |  |  |
Bank loans (Details) [Line Items] |  |  |  |  |
Drawings amount | ¥ 30,000 |  |  |  |
Fixed interest rate, percentage | 4.90% | 4.90% |  |  |
Mr. Peng Siguang |  |  |  |  |
Bank loans (Details) [Line Items] |  |  |  |  |
Drawings amount | $ |  | $ 30,000 |  |  |
Fixed interest rate, percentage | 5.00% | 5.00% |  |  |
Mr. Guo Yupeng |  |  |  |  |
Bank loans (Details) [Line Items] |  |  |  |  |
Drawings amount | $ |  | $ 40,000 |  |  |
Fixed interest rate, percentage | 5.00% | 5.00% |  |  |

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