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Summary of significant accounting policies (Details Narrative)
12 Months Ended
Dec. 31, 2024
USD ($)
shares
Dec. 31, 2024
CNY (¥)
shares
Dec. 31, 2023
CNY (¥)
shares
Dec. 31, 2022
CNY (¥)
Dec. 31, 2024
CNY (¥)
Accumulated other comprehensive income $ 6,915,066   ¥ 54,712,520   ¥ 49,708,261
Allowance for credit losses of accounts receivable     3,951,391   0
Prepaid services fees 3,081   0   22,149
Allowance for other receivables and prepaid expenses 678,227   3,228,306   4,875,364
Impairment loss 153,433   1,102,938   1,102,938
Impairment Of Long Lived Assets   ¥ 0 6,602,198 ¥ 13,713,233  
Convertible notes payable 20,740,480   (0)   ¥ 149,090,866
Government subsidies 979 7,037 605,184    
Total expenses $ 210,767 ¥ 1,515,078 ¥ 1,683,474 ¥ 1,739,048  
Dilutive shares | shares 22,810 22,810 9,664,959    
Shanghai Weimu [Member]          
Noncontrolling interests 42.00%       42.00%
Viwo Tech [Member]          
Noncontrolling interests 45.00%       45.00%
Vize Technology Limited [Member]          
Noncontrolling interests 45.00%       45.00%
Year End Translation Rates [Member] | China, Yuan Renminbi          
Foreign Currency Transactions, Description 7.1884 7.1884 7.0827    
Average Translation Rates [Member] | China, Yuan Renminbi          
Foreign Currency Transactions, Description 7.1217 7.1217 7.0467 6.7261