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Financial risk management objectives and policies - Interest rate risk (Details)
$ in Thousands
12 Months Ended
Dec. 31, 2021
USD ($)
Dec. 31, 2020
USD ($)
Disclosure of detailed information about financial instruments [abstract]    
Increase in Libor 15 15
Effect on loss (Increase in Libor) $ (52) $ (57)
Decrease in Libor (20) (20)
Effect on loss (Decrease in Libor) $ 69 $ 75