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Financial instruments (Tables)
 12 Months Ended
Dec. 31, 2023
Financial Instruments  
Disclosure Of Detailed Information About Financial Instruments By Category [Table Text Block]
    At December 31, 2023     At December 31, 2022     At December 31, 2021  
  Amortized Cost      
FVTPL		      
Total		     Amortized Cost      
FVTPL		      
Total		     Amortized Cost      
FVTPL		      
Total		  
Cash $ 7,313   $ -   $ 7,313   $ 10,309   $ -   $ 10,309   $ 3,259   $ -   $ 3,259  
Marketable securities   -     1,166     1,166     -     582     582     -     605     605  
Deposits   100     -     100     25     -     25     243     -     243  
Accounts receivable   374     -     374     369     -     369     372     -     372  
Total financial assets $ 7,787   $ 1,166   $ 8,953   $ 10,703     582   $ 11,285   $ 3,874     605   $ 4,479  
Accounts payable and accrued liabilities   1,034     -     1,034     1,148     -     1,148     1,888     -     1,888  
Total financial liabilities $ 1,034   $ -   $ 1,034   $ 1,148   $ -   $ 1,148   $ 1,888   $ -   $ 1,888  
Disclosure of significant unobservable inputs used in fair value measurement of equity [Table Text Block]
  At December 31
    2023     2022     2021  
    Level 1     Level 1     Level 1     Level 2(a)  
Marketable securities $ 1,166   $ 582   $ 282   $ 323  

(a) Marketable securities included in level 2 include warrants that were valued using an option pricing model which utilizes a combination of quoted prices and market-derived inputs, including volatility estimates.
Disclosure of maturity analysis for derivative financial liabilities [Table Text Block]
   

Within 1

year

    

2 to 3

years

    

Over 3

years

    

At December 31

2023

  
Accounts payable and accrued liabilities $ 1,034   $ -   $ -   $ 1,034  
Quebec flow-through expenditure requirements   1,223     -     -     1,223  
Undiscounted lease payments   189     64     -     253  
Total $ 2,446   $ 64   $ -   $ 2,510  
Disclosure of foreign currency exposure related to its financial assets and liabilities [Table Text Block]
    Years ended December 31  
  2023     2022     2021  
Financial assets                  
US$ bank accounts $ 1   $ 1   $ 569  
Financial liabilities                  
Accounts payable   (7 )   (61 )   (160 )
  $ (6 ) $ (60 ) $ 409