Note 7 - Net Loss Per Share - Antidilutive Securities (Details) - shares |
6 Months Ended | |
|---|---|---|
Jun. 30, 2026 |
Jun. 30, 2025 |
|
| Antidilutive securities (in shares) | 12,400,327 | 13,746,420 |
| Share-Based Payment Arrangement, Option [Member] | ||
| Antidilutive securities (in shares) | 11,670,734 | 13,511,482 |
| Warrant [Member] | ||
| Antidilutive securities (in shares) | 150,224 | 208,406 |
| Employee Stock Purchase Plan Award [Member] | ||
| Antidilutive securities (in shares) | 29,369 | 26,532 |
| Restricted Stock Units (RSUs) [Member] | ||
| Antidilutive securities (in shares) | 550,000 | 0 |