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Short-term investments | 12 Months Ended
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Dec. 31, 2024
Cash and Cash Equivalents [Abstract] |
Short-term investments | Note 6 — Short-term investments Short-term investments consist of the following:
Schedule of short term investments consist |  |  |  |  |  |  |  |  |
|  | December 31, 2023 |  |  | December 31, 2024 |  |  | December 31, 2024 |
|  | RMB |  |  | RMB |  |  | USD |
Marketable securities |  |  | 18,411,162 |  |  |  | 149,583,000 |  |  |  | 20,808,942 |
Fair value disclosure:
|  |  |  |  | December 31, 2023 |
|  | December 31, |  |  | Fair Value |
|  | 2023 |  |  | Level 1 |  |  | Level 2 |  |  | Level 3 |
|  | RMB |  |  | RMB |  |  | RMB |  |  | RMB |
Marketable securities |  |  | 18,411,162 |  |  |  | 18,411,162 |  |  |  | - |  |  |  | - |
|  |  |  |  | December 31, 2024 |
|  | December 31, |  |  | Fair Value |
|  | 2024 |  |  | Level 1 |  |  | Level 2 |  |  | Level 3 |
|  | RMB |  |  | RMB |  |  | RMB |  |  | RMB |
Marketable securities |  |  | 149,583,000 |  |  |  | 149,583,000 |  |  |  | - |  |  |  | - |
There is no transfer between the levels for the periods presented. As of December 31, 2023 and 2024, short-term investments amounted to RMB 18,411,162 and RMB 149,583,000 (USD 20,808,942), respectively. During the year ended December 31, 2024, the Company invested a total of RMB 365,970,754 (USD 50,911,295) and the fair value change resulted in gain of approximately RMB 12,639,976 (USD 1,758,385).

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- Definition The entire disclosure of the components of cash, cash equivalents, and short-term investments. Short-term investments may include current marketable securities. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 320 -Name Accounting Standards Codification -Publisher FASB -URI https://asc.fasb.org/320/tableOfContent + Details
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