v3.26.1
Summary of significant accounting policies (Details)
Jun. 30, 2026
Office Equipment [Member]  
Property, Plant and Equipment [Line Items]  
Estimated useful lives 3 years
Mechanical Equipment [Member] | Minimum [Member]  
Property, Plant and Equipment [Line Items]  
Estimated useful lives 3 years
Mechanical Equipment [Member] | Maximum [Member]  
Property, Plant and Equipment [Line Items]  
Estimated useful lives 5 years
Electronic And Other Equipment [Member] | Minimum [Member]  
Property, Plant and Equipment [Line Items]  
Estimated useful lives 3 years
Electronic And Other Equipment [Member] | Maximum [Member]  
Property, Plant and Equipment [Line Items]  
Estimated useful lives 5 years
Vehicles [Member] | Minimum [Member]  
Property, Plant and Equipment [Line Items]  
Estimated useful lives 3 years
Vehicles [Member] | Maximum [Member]  
Property, Plant and Equipment [Line Items]  
Estimated useful lives 5 years