Income taxes - Effect of Tax holiday and preferential tax rate (Details)	12 Months Ended
Dec. 31, 2022 CNY (¥) ¥ / shares	Dec. 31, 2022 USD ($) $ / shares	Dec. 31, 2021 CNY (¥) ¥ / shares	Dec. 31, 2020 CNY (¥) ¥ / shares
Income taxes
The aggregate amount tax benefit(expense) of the tax holiday and preferential tax rate	¥ 15,977,099	$ 2,316,462	¥ 25,716,398	¥ 2,160,562
Aggregate effect on basic net income per share \| (per share)	¥ 0.05	$ 0.01	¥ 0.08	¥ 0.01
Aggregate effect on diluted net income per share \| (per share)	¥ 0.05	$ 0.01	¥ 0.08	¥ (0.01)

No definition available.

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- Definition

The amount of income taxes from which a reporting entity is exempt or for which it will receive a reduction in income taxes as a result of the income tax holiday granted by the taxing jurisdiction.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SAB Topic 11.C)
-URI https://asc.fasb.org/extlink&oid=122134291&loc=d3e330215-122817

+ Details

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- Definition

Per share amount effect of the income tax benefit resulting from the income tax holidays granted by taxing jurisdictions.

+ References

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- Definition

Diluted net income per share amount effect of the income tax benefit resulting from the income tax holidays granted by taxing jurisdictions.

+ References

No definition available.

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