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Short-term investments (Details Narrative) | Dec. 31, 2024 USD ($) | Dec. 31, 2024 CNY (¥) | Dec. 31, 2023 CNY (¥)
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Cash and Cash Equivalents [Abstract] |  |  |
Short-Term Investments | $ 20,808,942 | ¥ 149,583,000 | ¥ 18,411,162
Investment Owned, Cost | 50,911,295 | 365,970,754 |
Investment Owned, Fair Value | $ 1,758,385 | ¥ 12,639,976 |

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