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Note 2 - Significant Accounting Policies (Tables) | 3 Months Ended
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Mar. 31, 2025
Notes Tables |
Fair Value Measurement Inputs and Valuation Techniques [Table Text Block] |
Exercise price per warrant |  | $ | 33.00 |
Conversion rate - common shares per warrant |  |  | 1.50 |
Closing price of common stock |  | $ | 23.72 |
Volatility |  |  | 75 | %
Risk-free interest rate |  |  | 5.40 | %
Expected life of option (in years) |  |  | 0.3 |
Dividend yield |  | zero |
Schedule of Segment Reporting Information, by Segment [Table Text Block] |
|  | Three months ended March 31, |
|  | 2025 |  |  | 2024 |
Operating expenses |  |  |  |  |  |  |  |
Research and development |  | $ | (13,666 | ) |  | $ | (16,233 | )
General and administrative |  |  | (10,920 | ) |  |  | (3,701 | )
Other segment items(a) |  |  | 1,183 |  |  |  | 44,977 |
Net income (loss) |  | $ | (23,403 | ) |  | $ | 25,043 |
|  | March 31, 2025 |  |  | December 31, 2024 |
Cash and cash equivalents |  | $ | 117,328 |  |  | $ | 128,574 |
Schedule of Earnings Per Share, Basic and Diluted [Table Text Block] |
|  | Three months ended |
|  | March 31, |
|  | 2025 |  |  | 2024 |
Numerator, basic: |  |  |  |  |  |  |  |
Net income (loss) |  | $ | (23,403 | ) |  | $ | 25,043 |
Denominator, basic: |  |  |  |  |  |  |  |
Weighted average common shares outstanding |  |  | 48,262 |  |  |  | 43,001 |
Net income (loss) per share, basic |  | $ | (0.48 | ) |  | $ | 0.58 |
Numerator, diluted: |  |  |  |  |  |  |  |
Net income (loss) |  | $ | (23,403 | ) |  | $ | 25,043 |
Adjustment for change in fair value of warrant liabilities |  |  | — |  |  |  | (43,792 | )
Adjusted numerator, diluted |  | $ | (23,403 | ) |  | $ | (18,749 | )
Denominator, diluted: |  |  |  |  |  |  |  |
Weighted average common shares outstanding |  |  | 48,262 |  |  |  | 43,001 |
Dilutive effect of common stock warrants |  |  | — |  |  |  | 1,101 |
Weighted average dilutive common shares |  |  | 48,262 |  |  |  | 44,102 |
Net loss per share, diluted |  | $ | (0.48 | ) |  | $ | (0.43 | )
Dilutive common stock options excluded from net loss per share, diluted |  |  | 3,751 |  |  |  | 2,664 |
Dilutive Performance Awards excluded from net loss per share, diluted |  |  | 7 |  |  |  | 7 |

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