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Short term investments (Details)	Dec. 31, 2024 USD ($)	Dec. 31, 2024 CNY (¥)	Dec. 31, 2023 CNY (¥)
Platform Operator, Crypto Asset [Line Items]
Marketable securities	$ 20,808,942	¥ 149,583,000	¥ 18,411,162
Fair Value, Inputs, Level 1 [Member]
Platform Operator, Crypto Asset [Line Items]
Marketable securities		149,583,000	18,411,162
Fair Value, Inputs, Level 2 [Member]
Platform Operator, Crypto Asset [Line Items]
Marketable securities
Fair Value, Inputs, Level 3 [Member]
Platform Operator, Crypto Asset [Line Items]
Marketable securities

X

- References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 405
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SAB Topic 5.FF.Q2)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147476188/405-10-S99-1

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- Definition

Amount of investment in marketable security.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Topic 942
-SubTopic 210
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03(4))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147478546/942-210-S99-1

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 210
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(2))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480566/210-10-S99-1

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