Stock-based compensation (Narrative) (Details) - USD ($)					3 Months Ended		9 Months Ended
	Sep. 27, 2026	Sep. 04, 2026	Jun. 03, 2026	Mar. 30, 2026	Sep. 30, 2026	Sep. 30, 2025	Sep. 30, 2026	Sep. 30, 2025
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Limit of options as a percentage of shares outstanding							10.00%
Number of stock options issued							91,000	16,500
Exercise price of warrants granted							$ 16.37	$ 149.5
Unrecognized stock-based compensation					$ 542,574		$ 542,574
Period for recognition							9 months 18 days
Weighted average grant-date fair value of options granted							$ 10.74
Stock-based compensation					$ 131,775	$ 852,757	$ 2,136,908	$ 1,082,482
Additional share-based compensation							$ 699,834
Stock options [Member] | Directors, Officers, and Employees [Member]
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Number of stock options issued	41,500	29,000	41,500	19,500
Exercise price of warrants granted		$ 8.53	$ 18	$ 25
Expiration period		5 years	5 years	5 years
Award vesting period		1 year	1 year	1 year
Stock options [Member] | Consultants [Member]
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Number of stock options issued	1,000
Exercise price of warrants granted	$ 7.5
Expiration period	5 years
Award vesting period	1 year