v3.26.1
Stock-based compensation (Schedule of assumptions used to estimate the fair value of options) (Details) - Stock options [Member]
6 Months Ended
Jun. 30, 2026
$ / shares
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]  
Exercise price $ 0.4
Share price $ 0.37
Dividend 0.00%
Risk-free interest 4.13%
Estimated life (years) 5 years
Expected volatility 76.33%