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Short-term investments (Details) | Dec. 31, 2024 CNY (¥) | Dec. 31, 2024 USD ($) | Dec. 31, 2023 CNY (¥)
--- | --- | --- | ---
Debt securities: |  |  |
Wealth management products issued by banks or security/trust companies | ¥ 178,821,757 | $ 24,498,480 | ¥ 350,164,305
Equity securities: |  |  |
Marketable equity securities | 939,725,698 | 128,741,893 | 292,729,235
Short-term investments | ¥ 1,118,547,455 | $ 153,240,373 | ¥ 642,893,540

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