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Shareholders’ equity (Details Narrative)
 1 Months Ended 12 Months Ended
Mar. 15, 2024
Nov. 29, 2024
Sep. 19, 2023
shares
Dec. 31, 2024
USD ($)
$ / shares
shares
Dec. 31, 2024
CNY (¥)
shares
Dec. 31, 2023
CNY (¥)
¥ / shares
shares
Dec. 31, 2024
CNY (¥)
¥ / shares
shares
May 14, 2018
$ / shares
shares
Class of Stock [Line Items]                
Reverse share split description The Meeting approved amendments to (i) every ten (10) shares of the Company’s ordinary share issued, par value of US$0.001, was consolidated into one (1) share of ordinary share, par value $0.01, and the authorized share capital of the Company was reduced from US$200,000 divided into 200,000,000 shares of a nominal or par value of US$0.0001 each to US$200,000 divided into 20,000,000 shares of a nominal or par value of US$0.01 each; (ii) increase the number of authorized Ordinary shares of the Company from US$200,000 divided into 20,000,000 shares of a nominal or par value of US$0.01 each to US$2,000,000 divided into 200,000,000 shares of a nominal or par value of US$0.01 each, by the creation of an additional 180,000,000 shares of a nominal or par value of US$0.01 each to rank pari passu in all respects with the existing shares in the capital of the Company. The Meeting approved amendments to (i) every 20 issued and unissued ordinary shares of a nominal or par value of US$0.01 each in the capital of the Company be consolidated into one (1) share of a nominal or par value of US$0.2 each such that following the Share Consolidation the authorized share capital of the Company will be changed from US$2,000,000 divided into 200,000,000 shares of a nominal or par value of US$0.01 each to US$2,000,000 divided into 10,000,000 shares of a nominal or par value of US$0.02 each; (ii) increase the authorized share capital of the Company from US$2,000,000 divided into 10,000,000 Consolidated Ordinary Shares of a nominal or par value of$0.2 each, to US$200,000,000 divided into 1,000,000,000 Consolidated Ordinary Shares of a nominal or par value of $0.2 each, by the creation of an additional 990,000,000 Consolidated Ordinary Shares.            
Share consolidation description       the share capital of the Company is US$200,000,000 divided into 1,000,000,000 shares comprising of (i) 800,000,000 Class A Ordinary Shares of a par value of US$0.2 each, and (ii) 200,000,000 Class B Ordinary Shares of a par value of US$0.2 each. the share capital of the Company is US$200,000,000 divided into 1,000,000,000 shares comprising of (i) 800,000,000 Class A Ordinary Shares of a par value of US$0.2 each, and (ii) 200,000,000 Class B Ordinary Shares of a par value of US$0.2 each.      
Retained earnings for statutory reserves       $ 1,134,146   ¥ 13,134,098 ¥ 8,152,694  
Statutory reserve       197,497   1,169,819 1,419,689  
Statutory reserves       1,134,146   ¥ 13,134,098 ¥ 8,152,694  
Paid-in-capital and statutory reserve       $ 18,007,285 ¥ 129,443,568      
Class A Ordinary Shares [Member]                
Class of Stock [Line Items]                
Shares issued     38,750     38,750 [1]    
Shares issued [1]       12,537,537 12,537,537      
Shares issued for cash, shares [1]       340,976 340,976      
Class B Ordinary Shares [Member]                
Class of Stock [Line Items]                
Shares issued [1]       10,000,000 10,000,000      
Ordinary Shares [Member]                
Class of Stock [Line Items]                
Common Stock, Shares Authorized               50,000,000
Common stock, par value | $ / shares               $ 0.001
Class A Ordinary Shares [Member]                
Class of Stock [Line Items]                
Common stock, par value | $ / shares       $ 0        
Ordinary stock, shares authorized       800,000,000     800,000,000  
Ordinary stock, shares issued       13,136,546     13,136,546  
Ordinary stock, shares outstanding       13,136,546     13,136,546  
Class B Ordinary Shares [Member]                
Class of Stock [Line Items]                
Common stock, par value | ¥ / shares             ¥ 0.2  
Ordinary stock, shares issued       10,000,000     10,000,000  
Ordinary stock, shares outstanding       10,000,000     10,000,000  
Statutory reserves       $ 890,475     ¥ 6,401,093  
Common Class A [Member]                
Class of Stock [Line Items]                
Common Stock, Shares Authorized       800,000,000   800,000,000 800,000,000  
Common stock, par value | ¥ / shares           ¥ 0.2 ¥ 0.2  
Ordinary stock, shares issued       13,136,546   258,033 13,136,546  
Ordinary stock, shares outstanding       13,136,546   258,033 13,136,546  
[1] Number of shares has been retrospectively adjusted for the share consolidation (10 to 1, and 20 to 1) effective March 22, 2024 and December 13, 2024