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Supplemental cash flow information (Tables)
 12 Months Ended
Dec. 31, 2023
Disclosure Of Supplemental Cash Flow Information [Abstract]  
Disclosure of changes in non-cash working capital [Table Text Block]
          Years ended December 31  
    2023     2022     2021  
Accounts receivable $ (5 ) $ (47 ) $ 505  
Prepaid expenses and deposits   (59 )   (94 )   260  
Accounts payable and accrued liabilities   (120 )   (762 )   (499 )
Changes in non-cash working capital $ (184 ) $ (903 ) $ 266  
Disclosure of cash received in operating activities [Table Text Block]
          Years ended December 31  
    2023     2022     2021  
Income taxes refunded $ (307 ) $ (187 ) $ (3,835 )
Income taxes paid   18     -     -  
Income tax expense (recovery) $ (289 ) $ (187 ) $ (3,835 )