Note 4 - Equity - Stock Option Activity (Details) - $ / shares |
3 Months Ended | |
|---|---|---|
Mar. 31, 2026 |
Mar. 31, 2025 |
|
| Outstanding, number of shares (in shares) | 5,705 | 5,706 |
| Outstanding, weighted average exercise price (in dollars per share) | $ 6,081.93 | $ 6,081.61 |
| Options expired or cancelled, number of shares (in shares) | 0 | 1 |
| Options expired or cancelled, weighted average exercise price (in dollars per share) | $ 0 | $ 4,280 |
| Outstanding, number of shares (in shares) | 5,705 | 5,705 |
| Outstanding, weighted average exercise price (in dollars per share) | $ 6,081.93 | $ 6,081.93 |