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Note 3 - Net Loss Per Share (Tables) | 6 Months Ended
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Jun. 30, 2025
Notes Tables |
Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share [Table Text Block] |
​ |  | Three Months Ended |  |  | Six Months Ended |
​ |  | June 30, |  |  | June 30, |
​ |  | 2025 |  |  | 2024 |  |  | 2025 |  |  | 2024 |
2029 Notes convertible to common stock (1) |  |  | 5,915,742 |  |  |  | — |  |  |  | 2,974,213 |  |  |  | — |
2026 Notes convertible to common stock (1)(2)(3) |  |  | 3,280,240 |  |  |  | 9,714,522 |  |  |  | 4,281,266 |  |  |  | 10,696,990 |
Outstanding options to purchase common stock |  |  | 981,651 |  |  |  | 84,864 |  |  |  | 2,790,290 |  |  |  | 90,635 |
Share-settled liability(4) |  |  | 552,662 |  |  |  | — |  |  |  | 277,858 |  |  |  | — |
Total potentially dilutive shares excluded from net loss per share |  |  | 10,730,295 |  |  |  | 9,799,386 |  |  |  | 10,323,627 |  |  |  | 10,787,625 |

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- Definition Tabular disclosure of securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) in the future that were not included in the computation of diluted EPS because to do so would increase EPS amounts or decrease loss per share amounts for the period presented, by antidilutive securities. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (c) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482662/260-10-50-1 + Details
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