v3.25.1
Stock options (Details) - Stock Options - $ / shares
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Outstanding, beginning of year 206,250 206,250 85,000
Granted     80,000
Cancelled     (41,250)
Bonus shares adjustment     82,500
Outstanding, end of year 206,250 206,250 206,250
Exercisable, end of year 206,250 86,250 86,250
Outstanding, beginning of years $ 1.52 $ 1.52 $ 1.56
Weighted average exercise price, Granted 0 0 2.80
Cancelled in period 0 0 (1.04)
Bonus shares adjustments 0 0 (0.72)
Outstanding, end of years 1.52 1.52 1.52
Exercisable, end of years $ 1.52 $ 1.04 $ 1.04