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Share based payments - Performance Share Units (Details) - PSU - item
12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Share based payments    
Balance at the beginning 63,889 87,500
Granted 18,057 87,500
Exercised (28,474)  
Expired (13,194)  
Balance at the ending 63,889 87,500