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Investment in equity method investee (Details) | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2024 CNY (¥) Partnership company | Dec. 31, 2024 USD ($) | Dec. 31, 2023 CNY (¥)
Schedule of equity method investments |  |  |
Investment in equity method investee | ¥ 146,100,984 | $ 20,000,000 | ¥ 136,804,441
Investments in limited partnership and limited company |  |  |
Schedule of equity method investments |  |  |
Investment in equity method investee | ¥ 103,000,000 | $ 14,000,000 | ¥ 89,000,000
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 |  |

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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 Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 323 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 3 -Subparagraph (a)(1) -Publisher FASB -URI https://asc.fasb.org/1943274/2147481687/323-10-50-3 + Details
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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 Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 270 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (i) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482964/270-10-50-1 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 280 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 32 -Subparagraph (ee) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482810/280-10-50-32 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 323 -SubTopic 10 -Name Accounting Standards Codification -Section 45 -Paragraph 1 -Publisher FASB -URI https://asc.fasb.org/1943274/2147481664/323-10-45-1 Reference 4: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 323 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 3 -Subparagraph (a)(3) -Publisher FASB -URI https://asc.fasb.org/1943274/2147481687/323-10-50-3 Reference 5: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 210 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(10)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480566/210-10-S99-1 Reference 6: http://www.xbrl.org/2003/role/disclosureRef -Topic 280 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 25 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482810/280-10-50-25 + Details
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