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Share based payments - Restricted Share Units (Details) - RSU - item
12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Share based payments    
Balance at the beginning 63,711 72,222
Granted 50,890 16,025
Exercised (29,108) (23,147)
Expired (7,204) (1,389)
Balance at the ending 78,289 63,711