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Short term investments (Details) | Dec. 31, 2024 USD ($) | Dec. 31, 2024 CNY (¥) | Dec. 31, 2023 CNY (¥)
--- | --- | --- | ---
Platform Operator, Crypto Asset [Line Items] |  |  |
Marketable securities | $ 20,808,942 | ¥ 149,583,000 | ¥ 18,411,162
Fair Value, Inputs, Level 1 [Member] |  |  |
Platform Operator, Crypto Asset [Line Items] |  |  |
Marketable securities |  | 149,583,000 | 18,411,162
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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