Loss per share (Schedule of dilutive securities excluded from computation) (Details) - shares |
6 Months Ended | |
|---|---|---|
Jun. 30, 2026 |
Jun. 30, 2025 |
|
| Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] | ||
| Potentially dilutive securities | 12,791,795 | 10,881,795 |
| Stock options [Member] | ||
| Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] | ||
| Potentially dilutive securities | 5,510,000 | 1,285,000 |
| Warrants [Member] | ||
| Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] | ||
| Potentially dilutive securities | 7,281,795 | 4,596,795 |
| Debentures [Member] | ||
| Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] | ||
| Potentially dilutive securities | 0 | 5,000,000 |