Number of limited companies in which investments were made during the period.

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- Definition

Number of limited partnerships in which investment was made.

+ References

No definition available.

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- Definition

The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting.

+ References

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- Definition

This item represents the carrying amount on the entity's balance sheet of its investment in common stock of an equity method investee. This is not an indicator of the fair value of the investment, rather it is the initial cost adjusted for the entity's share of earnings and losses of the investee, adjusted for any distributions (dividends) and other than temporary impairment (OTTI) losses recognized.

+ References

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Investment in equity method investee (Details)	12 Months Ended
Investment in equity method investee (Details)	Dec. 31, 2025 CNY (¥) company Partnership	Dec. 31, 2025 USD ($)	Dec. 31, 2024 CNY (¥)
Schedule of equity method investments
Investment in equity method investee	¥ 126,532,780	$ 18,000,000	¥ 146,100,984
Investments in limited partnership and limited company
Schedule of equity method investments
Investment in equity method investee	¥ 104,000,000	$ 15,000,000	¥ 103,000,000
Limited partnerships
Schedule of equity method investments
Number of limited partnerships in which investments made \| Partnership	4
Limited partnerships \| Minimum
Schedule of equity method investments
Equity method investment, ownership percentage	3.02%	3.02%
Limited partnerships \| Maximum
Schedule of equity method investments
Equity method investment, ownership percentage	99.99%	99.99%
Investment in limited company
Schedule of equity method investments
Number of limited Company in which investments made \| company	1