Interest income (Details) - USD ($)	3 Months Ended	9 Months Ended
Sep. 30, 2026	Sep. 30, 2025	Sep. 30, 2026	Sep. 30, 2025
Interest expense (income), defined benefit plans [abstract]
Interest on bank deposits	$ 187,598	$ 75,954	$ 443,269	$ 489,863
Total interest income	$ 187,598	$ 75,954	$ 443,269	$ 489,863

The amount of income arising from interest.

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