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Note 13 - Segment Information (Tables) | 6 Months Ended
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Jun. 30, 2026
Notes Tables |
Segment Reporting [Table Text Block] |
|  | Three Months Ended June 30, |  |  | Six Months Ended June 30, |
|  | 2026 |  |  | 2025 |  |  | 2026 |  |  | 2025 |
Operating expenses, excluding share-based compensation |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Research and development |  | $ | 7,641 |  |  | $ | 5,589 |  |  | $ | 15,325 |  |  | $ | 11,056 |
General and administrative |  |  | 1,739 |  |  |  | 1,647 |  |  |  | 3,715 |  |  |  | 3,457 |
Total operating expenses, excluding share-based compensation |  |  | 9,380 |  |  |  | 7,236 |  |  |  | 19,040 |  |  |  | 14,513 |
Share-based compensation |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Research and development |  |  | 512 |  |  |  | 233 |  |  |  | 815 |  |  |  | 422 |
General and administrative |  |  | 606 |  |  |  | 538 |  |  |  | 1,125 |  |  |  | 1,216 |
Total share-based compensation |  |  | 1,118 |  |  |  | 771 |  |  |  | 1,940 |  |  |  | 1,638 |
Operating loss |  |  | (10,498 | ) |  |  | (8,007 | ) |  |  | (20,980 | ) |  |  | (16,151 | )
Interest income |  |  | 385 |  |  |  | 313 |  |  |  | 855 |  |  |  | 757 |
Other income (expense), net |  |  | (19 | ) |  |  | 1 |  |  |  | (42 | ) |  |  | — |
Income tax expense |  |  | (7 | ) |  |  | (6 | ) |  |  | (14 | ) |  |  | (12 | )
Segment and consolidated net loss |  | $ | (10,139 | ) |  | $ | (7,699 | ) |  | $ | (20,181 | ) |  | $ | (15,406 | )

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