Stock-based compensation (Tables)

9 Months Ended

Sep. 30, 2026

Share-based Payment Arrangement [Abstract]

Schedule of stock option activity [Table Text Block]

	Number of options		Weighted average exercise price $	Weighted average remaining contractual life (years)	Aggregate intrinsic value $
Outstanding at December 31, 2024	23,700		73.50	4.18	59
Granted	16,500		149.50	4.81	-
Exercised	(2,900	)	55.50	-	-
Forfeited	(150	)	138	-	-
Outstanding at September 30, 2025	37,150		108.50	4.06	7.5
Exercisable at September 30, 2025	22,650		80.50	3.57	35
Unvested at September 30, 2025	14,500		152	4.18	-
Outstanding at December 31, 2025	50,100		102.72	2.75	-
Granted	91,000		16.37	4.72	-
Forfeited	(900	)	43.91	-	-
Outstanding at September 30, 2026	140,200		46.76	4.25	-
Exercisable at September 30, 2026	79,075		72.59	3.82	-
Unvested at September 30, 2026	61,125		13.33	4.80	-

Schedule of assumptions used to estimate the fair value of options [Table Text Block]

	September 30, 2026 Weighted-average
Exercise price	16.37
Share price	15.33
Dividend	-
Risk-free interest rate	4.27%
Estimated life (in years)	5
Expected volatility	129.93%