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Stock-based compensation (Tables)
3 Months Ended
Mar. 31, 2025
Share-based Payment Arrangement [Abstract]  
Schedule of stock option activity [Table Text Block]
    Number of
options
    Weighted
average
exercise price
C$
    Weighted
average
remaining
contractual life
(years)
    Aggregate
intrinsic value
C$
 
Outstanding at December 31, 2024   1,185,000     2.06     4.18     1.89  
Outstanding at March 31, 2025   1,185,000     2.06     3.94     1.66  
Exercisable at March 31, 2025   927,500     1.46     3.59     2.26  
Unvested at March 31, 2025   257,500     3.68     4.69     0.04