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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 6 Months Ended
Jun. 30, 2025
Mar. 31, 2025
Jun. 30, 2024
Mar. 31, 2024
Jun. 30, 2025
Jun. 30, 2024
Net income (loss) $ (44,224) $ (23,403) $ 6,155 $ 25,043 $ (67,627) $ 31,198
Weighted average common shares outstanding (in shares) 48,308   46,202   48,285 44,601
Net income (loss) per share, basic (in dollars per share) $ (0.92)   $ 0.13   $ (1.4) $ 0.7
Adjustment for change in fair value of warrant liabilities $ 0   $ 0   $ 0 $ (43,793)
Adjusted numerator, diluted $ (44,224)   $ 6,155   $ (67,627) $ (12,595)
Dilutive effect of common stock warrants (in shares) 0   0   0 551
Weighted average dilutive common shares (in shares) 48,308   46,202   48,285 45,152
Net income (loss) per share, diluted (in dollars per share) $ (0.92)   $ 0.13   $ (1.4) $ (0.28)
Share-Based Payment Arrangement, Option [Member]            
Dilutive common stock options excluded from net income (loss) per share, diluted (in shares) 4,176   2,703   3,910 2,674
Warrant [Member]            
Dilutive common stock options excluded from net income (loss) per share, diluted (in shares) 7   7   7 7