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Subsequent events (Details)
¥ in Millions
Jan. 14, 2023
USD ($)
Jan. 14, 2023
CNY (¥)
Jan. 07, 2023
USD ($)
Jan. 07, 2023
CNY (¥)
Jan. 05, 2023
USD ($)
Jan. 05, 2023
CNY (¥)
Jan. 05, 2024
Jan. 17, 2023
USD ($)
Jan. 14, 2023
CNY (¥)
Jan. 12, 2023
USD ($)
Jan. 12, 2023
CNY (¥)
Jan. 06, 2023
USD ($)
Jan. 06, 2023
CNY (¥)
Subsequent events (Details) [Line Items]                          
Maximum amount         $ 1,600,000                
Short-term loans percentage         3.85%                
Subsequent Event [Member]                          
Subsequent events (Details) [Line Items]                          
Maximum amount $ 1,400,000 ¥ 10.0 $ 1,400,000 ¥ 10.0   ¥ 10.0              
Bearing interest $ 129       $ 120                
Short-term loans percentage 4.70%   3.65% 3.65%         4.70%        
Amount borrowed               $ 1,400,000 ¥ 10.0 $ 700,000 ¥ 5.0 $ 1,400,000 ¥ 10.0
Utilized amount         $ 200,000 ¥ 1.5              
Forecast [Member]                          
Subsequent events (Details) [Line Items]                          
Interest rate percentage             2.70%