Fair value of assets and liabilities - Notional Amount/ Maximum Potential Payout, Fair Value (Details)	Dec. 31, 2025 CNY (¥)	Dec. 31, 2025 USD ($)	Dec. 31, 2024 CNY (¥)
Financial Instruments Recorded at Fair Value on a Recurring Basis
Financial guarantee derivative assets, Fair value	¥ 0	$ 0	¥ 1,038,258
Financial guarantee derivative, Fair value	15,425,681	2,205,843	0
Recurring
Financial Instruments Recorded at Fair Value on a Recurring Basis
Financial guarantee derivative assets, Notional Amount	0	0	130,290,057
Financial guarantee derivative assets, Maximum Potential Payout	0	0	21,975,258
Financial guarantee derivative assets, Fair value	0	0	1,038,258
Financial guarantee derivative liabilities, Notional Amount	245,983,263	35,175,139	0
Financial guarantee derivative liabilities, Maximum Potential Payout	133,219,259	19,050,101	0
Financial guarantee derivative, Fair value	¥ 15,425,681	$ 2,205,843	¥ 0

Fair value, after the effects of master netting arrangements, of a financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes assets not subject to a master netting arrangement and not elected to be offset.

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+ Details

- Definition

Fair value, after the effects of master netting arrangements, of a financial liability or contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes liabilities not subject to a master netting arrangement and not elected to be offset.

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+ Details