XML 88 R66.htm IDEA: XBRL DOCUMENT v3.25.1
Other current assets - Additional information (Details)
12 Months Ended
Dec. 31, 2024
CNY (¥)
Dec. 31, 2023
CNY (¥)
Dec. 31, 2024
USD ($)
Other current assets      
Impairment of inventory ¥ 0 ¥ 240,000  
Inventory gross amount 10,674,018 10,383,964 $ 1,462,334
Valuation allowance of inventory 9,179,453    
Receivables from individuals ¥ 46,000,000 ¥ 76,000,000  
Minimum      
Other current assets      
Interest rates 0.00%    
Maximum      
Other current assets      
Interest rates 5.50%