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Short term investments (Details 1) | Jun. 30, 2025 USD ($) | Jun. 30, 2025 CNY (¥) | Dec. 31, 2024 CNY (¥)
--- | --- | --- | ---
Platform Operator, Crypto Asset [Line Items] |  |  |
Marketable securities | $ 66,060,012 | ¥ 472,897,200 | ¥ 149,583,000
Fair Value, Inputs, Level 1 [Member] |  |  |
Platform Operator, Crypto Asset [Line Items] |  |  |
Marketable securities |  | 472,897,200 | 149,583,000
Fair Value, Inputs, Level 2 [Member] |  |  |
Platform Operator, Crypto Asset [Line Items] |  |  |
Marketable securities |  |  |
Fair Value, Inputs, Level 3 [Member] |  |  |
Platform Operator, Crypto Asset [Line Items] |  |  |
Marketable securities |  |  |

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