Note 11 - Net Loss per Share - Antidilutive Securities (Details) - shares |
3 Months Ended | |
|---|---|---|
Mar. 31, 2026 |
Mar. 31, 2025 |
|
| Antidilutive securities (in shares) | 11,641,604 | 1,023,218 |
| Warrant [Member] | ||
| Antidilutive securities (in shares) | 1,136,595 | 840,032 |
| Share-Based Payment Arrangement, Option [Member] | ||
| Antidilutive securities (in shares) | 345,300 | 113,975 |
| Series B Convertible Preferred Stock [Member] | ||
| Antidilutive securities (in shares) | 916,997 | 0 |
| Series C1 Convertible Preferred Stock [Member] | ||
| Antidilutive securities (in shares) | 2,426,573 | 0 |
| Series J Preferred Stock [Member] | ||
| Antidilutive securities (in shares) | 6,083,005 | 0 |
| Series X Preferred Stock [Member] | ||
| Antidilutive securities (in shares) | 0 | 66,580 |
| Restricted Stock [Member] | ||
| Antidilutive securities (in shares) | 0 | 2,631 |
| Convertible Notes Payable [Member] | ||
| Antidilutive securities (in shares) | 733,134 | 0 |