Income taxes - Unrecognized tax benefit (Details)	12 Months Ended
Dec. 31, 2025 CNY (¥)	Dec. 31, 2025 USD ($)	Dec. 31, 2024 CNY (¥)	Dec. 31, 2023 CNY (¥)	Dec. 31, 2025 USD ($)
Roll-forward of unrecognized tax benefits
Balance at beginning of the year	¥ 463,456,089	$ 66,273,339	¥ 364,866,929	¥ 259,386,286
Additions for tax positions taken in current year	322,251,105	46,081,295	310,256,632	262,052,034
Reductions for tax positions taken in prior years	(253,438,648)	(36,241,245)	(211,667,472)	(156,571,391)
Balance at end of the year	532,268,546	76,113,389	463,456,089	364,866,929
Accrued interest and penalties	15,274,707		9,195,253		$ 2,184,254
Tax impact arising from impairment losses and charge-offs of accounts receivable and contract assets	180,110,598	25,755,473	107,202,546
Unrecognized tax benefits arising from charge-offs of loans receivable				50,384,562
unrecognized tax benefits arising from charge-offs of subrogation receivable related to the guaranteed services	28,805,573		0	0	4,119,142
Unrecognized tax benefits from taxable income tax return	323,352,375		356,253,543	314,482,367	46,238,775
Unrecognized tax benefit that affects the tax rate	102,814,895		102,814,895	102,814,895	$ 14,702,334
Interest related to unrecognized tax benefit	¥ 6,079,454	$ 869,350	¥ 5,067,905	¥ 2,126,378

A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

No definition available.

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- Definition

Amount of unrecognized tax benefits.

+ References

Reference 1: http://www.xbrl.org/2003/role/exampleRef
-Topic 740
-SubTopic 10
-Name Accounting Standards Codification
-Section 55
-Paragraph 217
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482663/740-10-55-217

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
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Reference 3: http://www.xbrl.org/2003/role/disclosureRef
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-Name Accounting Standards Codification
-Section 45
-Paragraph 10B
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482525/740-10-45-10B

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- Definition

Amount of decrease in unrecognized tax benefits resulting from tax positions taken in prior period tax returns.

+ References

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- Definition

Amount of increase in unrecognized tax benefits resulting from tax positions that have been or will be taken in current period tax return.

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- Definition

Amount of interest expense accrued for an underpayment of income taxes.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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-Name Accounting Standards Codification
-Section 50
-Paragraph 15
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Amount of interest expense for an underpayment of income taxes.

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- Definition

The total amount of unrecognized tax benefits that, if recognized, would affect the effective tax rate.

+ References

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- Definition

Amount of unrecognized tax benefits arising from charge-off of loans receivable, accounts receivable and contract asset.

+ References

No definition available.

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- Definition

Amount of unrecognized tax benefits arising from charge-off subrogation receivable related to guarantee services.

+ References

No definition available.

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- Definition

Amount of unrecognized tax benefits arising from difference in timing for including certain taxable income in tax return.

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Amount of increase in unrecognized tax benefits resulting from tax positions taken in prior period tax returns relating to impairment losses and charge-offs of accounts receivable and contract assets .

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