Income taxes - Income before income tax expense (Details) |
12 Months Ended | |||
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Dec. 31, 2025
CNY (¥)
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Dec. 31, 2025
USD ($)
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Dec. 31, 2024
CNY (¥)
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Dec. 31, 2023
CNY (¥)
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| Income taxes | ||||
| Income before income tax expense, domestic | ¥ 466,207,421 | $ 66,666,775 | ||
| Net income before income taxes | 739,301,975 | 105,718,775 | ¥ 157,537,018 | ¥ 101,474,055 |
| Cayman | ||||
| Income taxes | ||||
| Income before income tax expense, foreign | 418,226,619 | 59,805,611 | ||
| Others | ||||
| Income taxes | ||||
| Income before income tax expense, foreign | ¥ (145,132,065) | $ (20,753,611) | ||
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. No definition available.
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- Definition The portion of earnings or loss from continuing operations before income taxes that is attributable to domestic operations. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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- Definition Amount of income (loss) from continuing operations, including income (loss) from equity method investments, before deduction of income tax expense (benefit), and income (loss) attributable to noncontrolling interest. Reference 1: http://www.xbrl.org/2003/role/exampleRef
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- Definition The portion of earnings or loss from continuing operations before income taxes that is attributable to foreign operations, which is defined as Income or Loss generated from operations located outside the entity's country of domicile. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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