Note 4 - Equity - Common Stock Purchase Warrant Activity (Details) - $ / shares |
3 Months Ended | 6 Months Ended | ||||
|---|---|---|---|---|---|---|
Jun. 30, 2026 |
Mar. 31, 2026 |
Jun. 30, 2025 |
Mar. 31, 2025 |
Jun. 30, 2026 |
Jun. 30, 2025 |
|
| Outstanding, warrants (in shares) | 60,008 | 60,009 | 1,816 | 1,816 | 60,009 | 1,816 |
| Outstanding, weighted average exercise price (in dollars per share) | $ 554.17 | $ 559.45 | $ 11,825.2 | $ 11,825.2 | $ 559.45 | $ 11,825.2 |
| Warrants cancelled or expired, warrants (in shares) | 1 | 0 | ||||
| Warrants cancelled or expired, weighted average exercise price (in dollars per share) | $ 317,680 | $ 0 | ||||
| Outstanding, warrants (in shares) | 60,008 | 60,008 | 1,816 | 1,816 | 60,008 | 1,816 |
| Outstanding, weighted average exercise price (in dollars per share) | $ 554.17 | $ 554.17 | $ 11,825.2 | $ 11,825.2 | $ 554.17 | $ 11,825.2 |
| Outstanding, weighted average exercise price (in dollars per share) | $ 554.17 | $ 554.17 | $ 11,825.2 | $ 11,825.2 | $ 554.17 | $ 11,825.2 |