Income taxes - Effect of preferential tax rate (Details)	12 Months Ended
Dec. 31, 2025 CNY (¥) ¥ / shares	Dec. 31, 2025 USD ($) $ / shares	Dec. 31, 2024 CNY (¥) ¥ / shares	Dec. 31, 2023 CNY (¥) ¥ / shares
Income taxes
The aggregate amount income tax expense of the preferential tax rate	¥ 211,556,757	$ 30,252,214	¥ 207,311,932	¥ 134,240,494
Aggregate effect on basic net income per share \| (per share)	¥ 0.87	$ 0.12	¥ 0.72	¥ 0.47
Aggregate effect on diluted net income per share \| (per share)	¥ 0.85	$ 0.12	¥ 0.71	¥ 0.46

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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
-Topic 740
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 2
-Subparagraph (SAB Topic 11.C)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479360/740-10-S99-2

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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

+ Details

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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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