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Summary of significant accounting policies (Details)
Dec. 31, 2022
USD ($)
Property [Member]  
Statement [Line Items]  
Estimated Useful Life $ 20
Leasehold improvements [Member]  
Statement [Line Items]  
Estimated Useful Life 5
Vehicles [Member]  
Statement [Line Items]  
Estimated Useful Life 5
Office equipment and furniture [Member] | Minimum [Member]  
Statement [Line Items]  
Estimated Useful Life 3
Office equipment and furniture [Member] | Maximum [Member]  
Statement [Line Items]  
Estimated Useful Life $ 5