Short-term investments (Details) |
Dec. 31, 2025
CNY (¥)
|
Dec. 31, 2025
USD ($)
|
Dec. 31, 2024
CNY (¥)
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|---|---|---|---|
| Debt securities: | |||
| Wealth management products, government bonds, or products issued by banks or security/trust companies | ¥ 117,501,734 | $ 16,802,524 | ¥ 178,821,757 |
| Equity securities: | |||
| Marketable equity securities | 761,723,058 | 108,924,949 | 939,725,698 |
| Short-term investments | ¥ 879,224,792 | $ 125,727,473 | ¥ 1,118,547,455 |
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- References No definition available.
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- References No definition available.
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- Definition Amount of investment in marketable security, classified as current. Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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- Definition Amount of investments including trading securities, available-for-sale securities, held-to-maturity securities, and short-term investments classified as other and current. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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- Definition Amount of investment in debt security measured at fair value with change in fair value recognized in net income (trading). Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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