Note 7 - Stockholders' Equity - Stock Warrants (Details) - USD ($) $ / shares in Units, $ in Thousands |
12 Months Ended | ||
|---|---|---|---|
Dec. 31, 2025 |
Dec. 31, 2024 |
Dec. 31, 2023 |
|
| Warrants, outstanding (in shares) | 1,476,200 | 524,601 | |
| Outstanding, weighted average exercise price (in dollars per share) | $ 8.64 | $ 32.42 | |
| Outstanding, aggregate intrinsic value | $ 0 | $ 0 | $ 1 |
| Warrants, Granted (in shares) | 1,861,817 | ||
| Granted, weighted average exercise price (in dollars per share) | $ 6.23 | ||
| Warrants, Exercised (in shares) | (910,218) | ||
| Exercised, weighted average exercise price (in dollars per share) | $ 10.16 | ||
| Warrants, Expired (in shares) | (703,459) | ||
| Expired, weighted average exercise price (in dollars per share) | $ 6.52 | ||
| Warrants, outstanding (in shares) | 772,741 | 1,476,200 | 524,601 |
| Outstanding, weighted average exercise price (in dollars per share) | $ 10.56 | $ 8.64 | $ 32.42 |