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Summary of significant accounting policies, Right-of-use assets and lease liabilities (Details)
12 Months Ended
Dec. 31, 2022
Buildings [Member]  
Right-of-use assets and lease liabilities:  
Estimated lease term 5 years
Office Equipment [Member]  
Right-of-use assets and lease liabilities:  
Estimated lease term 5 years
IT Equipment  
Right-of-use assets and lease liabilities:  
Estimated lease term 5 years