| Schedule of Short-term Investments |
| | | | | | | | | As of December 31, | | | 2024 | | 2025 | | 2025 | | | RMB | | RMB | | US$ | Time deposits and held-to-maturity debt securities | | 210,368,027 | | 220,422,862 | | 31,520,049 | Equity securities | | 44,479,404 | | 66,033,596 | | 9,442,679 | Available-for-sale debt securities | | 6,319,014 | | 19,599,692 | | 2,802,719 | Other debt investments | | 12,625,411 | | 7,351,532 | | 1,051,255 | | | 273,791,856 | | 313,407,682 | | 44,816,702 |
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| Schedule of summary of details of available-for-sale debt securities |
| | | | | | | | | | | As of December 31, 2024 | | | | | | | | | Fair Value | | | | | Gross | | Gross | | (Net | | | Amortized | | Unrealized | | Unrealized | | Carrying | | | Cost | | Gains | | Losses | | Amount) | | | RMB | | RMB | | RMB | | RMB | Due in 1 year | | 6,289,405 | | 29,613 | | (4) | | 6,319,014 |
| | | | | | | | | | | | | As of December 31, 2025 | | | | | | | | | Fair Value | | Fair Value | | | | | Gross | | Gross | | (Net | | (Net | | | Amortized | | Unrealized | | Unrealized | | Carrying | | Carrying | | | Cost | | Gains | | Losses | | Amount) | | Amount) | | | RMB | | RMB | | RMB | | RMB | | US$ | Due in 1 year | | 19,544,915 | | 55,198 | | (421) | | 19,599,692 | | 2,802,719 |
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