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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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The interest rate applicable to the portion of the carrying amount of long-term borrowings outstanding as of the balance sheet date, including current maturities, which accrues interest at a set, unchanging rate.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.22(a)(1))
-URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682

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