Fair value of assets and liabilities (Tables)
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12 Months Ended |
Dec. 31, 2025 |
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| Fair value of assets and liabilities |
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| Schedule of fair value hierarchy for assets and liabilities measured at fair value on a recurring basis |
| | | | | | | | | | | | | | | | | Balance at Fair | | | Level 1 | | Level 2 | | Level 3 | | Value | December 31, 2024 | | (RMB) | | (RMB) | | (RMB) | | (RMB) | Assets | | | | | | | | | Financial guarantee derivative | | — | | — | | 1,038,258 | | 1,038,258 | Financial investments | | — | | — | | 266,684,257 | | 266,684,257 | Total assets | | — | | — | | 267,722,515 | | 267,722,515 |
| | | | | | | | | | | | | | | | | Balance at Fair | | | Level 1 | | Level 2 | | Level 3 | | Value | December 31, 2025 | | (RMB) | | (RMB) | | (RMB) | | (RMB) | Assets | | | | | | | | | Financial investments | | — | | 914,493,536 | | 125,988,946 | | 1,040,482,482 | Liabilities | | | | | | | | | Financial guarantee derivative | | — | | — | | 15,425,681 | | 15,425,681 |
| | | | | | | | | | | | | | | | | Balance at Fair | | | Level 1 | | Level 2 | | Level 3 | | Value | December 31, 2025 | | (US$) | | (US$) | | (US$) | | (US$) | Assets | | | | | | | | | Financial investments | | — | | 130,770,835 | | 18,016,179 | | 148,787,014 | Liabilities | | | | | | | | | Financial guarantee derivative | | — | | — | | 2,205,843 | | 2,205,843 |
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| Schedule of notional amount is simply a reference amount used to calculate payments |
| | | | | | | | | Notional Amount | | Maximum Potential Payout | | Fair Value | December 31, 2024 | | RMB | | RMB | | RMB | Financial guarantee derivative assets | | 130,290,057 | | 21,975,258 | | 1,038,258 | Financial guarantee derivative liabilities | | — | | — | | — |
| | | | | | | | | Notional Amount | | Maximum Potential Payout | | Fair Value | December 31, 2025 | | RMB | | RMB | | RMB | Financial guarantee derivative assets | | — | | — | | — | Financial guarantee derivative liabilities | | 245,983,263 | | 133,219,259 | | 15,425,681 |
| | | | | | | | | Notional Amount | | Maximum Potential Payout | | Fair Value | December 31, 2025 | | US$ | | US$ | | US$ | Financial guarantee derivative assets | | — | | — | | — | Financial guarantee derivative liabilities | | 35,175,139 | | 19,050,101 | | 2,205,843 |
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| Schedule of fair value change recorded on financial guarantee derivatives |
| | | | | | | | | | | Year ended | | Year ended | | | | | | | December 31, | | December 31, | | Year ended December 31, | | | 2023 | | 2024 | | 2025 | | 2025 | | | RMB | | RMB | | RMB | | US$ | Opening balance of financial guarantee derivative assets (liabilities) | | (107,890,394) | | — | | 1,038,258 | | 148,469 | Change in fair value of financial guarantee derivative | | 24,966,242 | | 1,038,258 | | (3,367,074) | | (481,485) | Cash received | | (10,965,160) | | — | | (46,801,092) | | (6,692,467) | Net cash payout | | 93,889,312 | | — | | 33,704,227 | | 4,819,640 | Ending balance of financial guarantee derivative assets (liabilities) | | — | | 1,038,258 | | (15,425,681) | | (2,205,843) |
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