Financial investments - Summary of investments measured under amortization cost (Details) |
12 Months Ended | ||
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Dec. 31, 2025
CNY (¥)
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Dec. 31, 2025
USD ($)
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Dec. 31, 2024
CNY (¥)
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| Investments measured under amortization cost | |||
| Amortized cost, beginning balance | ¥ 5,010,417 | $ 716,480 | |
| Additions during the year | 10,000,000 | 1,429,981 | ¥ 5,000,000 |
| Maturities during the year | (10,062,632) | (1,438,937) | |
| Interest earned during the year | 52,215 | 7,467 | |
| Interest accrued during the year | 9,792 | 1,400 | 10,417 |
| Amortized cost, ending balance | ¥ 5,009,792 | $ 716,391 | ¥ 5,010,417 |
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- Definition Amount, after allowance for credit loss, of investment in debt security measured at amortized cost (held-to-maturity). Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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- References No definition available.
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- Definition Amount of cash outflow through purchase of long-term held-to-maturity securities. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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- Definition The cash inflow associated with the maturity, prepayments and calls (requests for early payments) of debt securities designated as held-to-maturity. Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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- Definition Amount of increase in held to maturity arising from interest accrued during the period. No definition available.
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- Definition Amount of increase in held to maturity arising from interest earned during the period. No definition available.
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