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Income Taxes (Tables) | 12 Months Ended
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Dec. 31, 2024
Income taxes |
Schedule of Current and Deferred Component of Income Tax Expense | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | For the years ended December 31,
​ | ​ | 2022 | ​ | 2023 | ​ | 2024
​ |  | RMB |  | RMB |  | RMB |  | US$
Current income tax expense |  | 71,567,448 |  | 64,458,408 |  | 65,805,623 |  | 9,015,333
Deferred income tax expense/(benefit) |  | 20,860,679 |  | (2,117,892) |  | — |  | —
Total income tax expense |  | 92,428,127 |  | 62,340,516 |  | 65,805,623 |  | 9,015,333
Schedule of Principal Components of Deferred Tax Assets and Liabilities | ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | As of December 31,
​ | ​ | 2023 | ​ | 2024
​ |  | RMB |  | RMB |  | US$
Deferred tax assets: |  |  |  |  |  |
Allowance for loan principal and financing service fee receivables |  | 19,785,153 |  | — | ​ | —
Allowance for finance lease receivable |  | 7,706,311 |  | 1,613,414 | ​ | 221,037
Allowance for other current assets |  | 30,286,267 |  | 19,387,060 | ​ | 2,656,016
Impairment loss from long-lived assets |  | 539,153 |  | 385,314 | ​ | 52,788
Guarantee liabilities |  | 3,517,157 |  | 47,762 | ​ | 6,543
Share-based compensation |  | 33,692,676 |  | 34,309,231 | ​ | 4,700,345
Fair value change on investments |  | 67,463,987 |  | 105,192,397 | ​ | 14,411,299
Fair value change on financial assets |  | 82,220,720 |  | 839,617 | ​ | 115,027
Lease liabilities |  | 18,156,568 |  | 11,008,553 | ​ | 1,508,166
Advertising cost |  | 23,090,520 |  | 23,027,357 | ​ | 3,154,735
Uncollected revenue |  | 4,798,460 |  | — | ​ | —
Outside basis difference | ​ | 19,604,247 | ​ | — | ​ | —
Net operating loss carry forwards | ​ | 775,049,194 | ​ | 609,993,234 | ​ | 83,568,730
Total deferred tax assets |  | 1,085,910,413 |  | 805,803,939 | ​ | 110,394,686
Less: valuation allowance |  | (1,008,969,418) |  | (759,896,561) | ​ | (104,105,402)
Total deferred tax assets, net of valuation allowance |  | 76,940,995 |  | 45,907,378 | ​ | 6,289,284
Net off against deferred tax liabilities | ​ | (76,940,995) | ​ | (45,907,378) | ​ | (6,289,284)
Net deferred tax assets |  | — |  | — | ​ | —
Deferred tax liabilities: |  | ​ |  | ​ | ​ | ​
Right-of-use assets |  | 18,572,655 |  | 11,113,077 | ​ | 1,522,486
Fair value change on financial assets |  | 58,368,340 |  | 34,794,301 | ​ | 4,766,798
Total deferred tax liabilities |  | 76,940,995 |  | 45,907,378 | ​ | 6,289,284
Net off against deferred tax assets |  | (76,940,995) |  | (45,907,378) | ​ | (6,289,284)
Net deferred tax liabilities |  | — |  | — | ​ | —
Schedule of Reconciliation of Income Taxes Expense | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | For the years ended December 31, | ​
​ | ​ | 2022 | ​ | 2023 | ​ | 2024 |
​ |  | RMB |  | RMB |  | RMB |  | US$ |
Profit (loss) before income tax |  | (269,623,829) |  | 101,474,055 |  | 157,537,018 |  | 21,582,482 | ​
PRC statutory income tax rate |  | 25 | % | 25 | % | 25 | % | 25 | %
Income tax expense (benefit) at PRC statutory income tax rate |  | (67,405,957) |  | 25,368,514 |  | 39,384,255 |  | 5,395,621 | ​
Effect of different tax rates |  | 12,944,788 |  | (25,070,403) |  | (97,962,122) |  | (13,420,756) | ​
Tax exempted income |  | — |  | (198,231) |  | (113,208,078) |  | (15,509,443) | ​
Outside basis difference | ​ | (109,594,486) | ​ | (215,985,749) | ​ | — | ​ | — | ​
Expenses not deductible for tax purposes |  | 12,666,674 |  | 36,882,867 |  | 13,122,045 |  | 1,797,713 | ​
Adjustment on current income tax of the previous periods |  | (18,081,862) |  | (18,394,143) |  | — |  | — | ​
Non-deductible guarantee liability: |  | — |  | 93,833,446 |  | — |  | — | ​
Write-off of NOL and others | ​ | — | ​ | 252,778,471 | ​ | 450,292,380 | ​ | 61,689,803 | ​
Withholding income tax |  | — |  | 4,427,205 |  | 23,250,000 |  | 3,185,237 | ​
Changes in valuation allowance |  | 261,898,970 |  | (91,301,461) |  | (249,072,857) |  | (34,122,842) | ​
Income tax expenses | ​ | 92,428,127 | ​ | 62,340,516 | ​ | 65,805,623 | ​ | 9,015,333 | ​
Schedule of Unrecognized Tax Benefits | ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | For the years ended December 31,
​ | ​ | 2023 | ​ | 2024
​ |  | RMB |  | RMB |  | US$
Balance at beginning of the year |  | — |  | — |  | —
Additions |  | 34,580,410 |  | — |  | —
Decreases |  | (34,580,410) |  | — |  | —
Balance at end of the year |  | — |  | — |  | —

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