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Financial assets and liabilities - Risk Management Strategy (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Reasonably possible increase in interest rates    
Expected loss rates 36 months  
Interest rate risk    
Reasonably possible increase in interest rates    
Loss before income taxes due to 1% higher interest rate on the average cash balance $ 235 $ 376
Loss before income taxes due to 1% higher interest rate on the average long-term debt balance $ 71 $ 72