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Key management personnel (Tables)
 12 Months Ended
Dec. 31, 2023
Disclosure Of Share Option And Warrant Reserves [Abstract]  
Disclosure of amounts incurred by entity for provision of key management personnel services provided by separate management entities [Table Text Block]
  Years ended December 31  
    2023     2022     2021  
Short-term benefits provided to executives (a) $ 1,109   $ 1,719   $ 982  
Directors' fees paid to non-executive directors   289     203     204  
Share-based payments   1,013     1,059     1,206  
Total $ 2,411   $ 2,981   $ 2,392