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Note 2 - Significant Accounting Policies - Calculation of Net Loss Per Share (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
 3 Months Ended
Mar. 31, 2025
Mar. 31, 2024
Net income (loss) $ (23,403) $ 25,043
Weighted average common shares outstanding (in shares) 48,262 43,001
Net income (loss) per share, basic (in dollars per share) $ (0.48) $ 0.58
Adjustment for change in fair value of warrant liabilities $ 0 $ (43,792)
Adjusted numerator, diluted $ (23,403) $ (18,749)
Dilutive effect of common stock warrants (in shares) 0 1,101
Weighted average dilutive common shares (in shares) 48,262 44,102
Net loss per share, diluted (in dollars per share) $ (0.48) $ (0.43)
Share-Based Payment Arrangement, Option [Member]    
Dilutive common stock options excluded from net loss per share, diluted (in shares) 3,751 2,664
Warrant [Member]    
Dilutive common stock options excluded from net loss per share, diluted (in shares) 7 7