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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, 2024
Mar. 31, 2024
Jun. 30, 2023
Mar. 31, 2023
Jun. 30, 2024
Jun. 30, 2023
Net income (loss) $ 6,155 $ 25,043 $ (26,376) $ (24,271) $ 31,198 $ (50,647)
Weighted average common shares outstanding (in shares) 46,202   41,793   44,601 41,766
Net income (loss) per share, basic (in dollars per share) $ 0.13   $ (0.63)   $ 0.7 $ (1.21)
Adjustment for change in fair value of warrant liabilities $ 0   $ 0   $ (43,793) $ 0
Adjusted numerator, diluted $ 6,155   $ (26,376)   $ (12,595) $ (50,647)
Dilutive effect of common stock warrants (in shares) 0   0   551 0
Weighted average dilutive common shares (in shares) 46,202   41,793   45,152 41,766
Net income (loss) per share, diluted (in dollars per share) $ 0.13   $ (0.63)   $ (0.28) $ (1.21)
Share-Based Payment Arrangement, Option [Member]            
Dilutive common stock options excluded from net income (loss) per share, diluted (in shares) 2,703   2,001   2,674 2,018
Warrant [Member]            
Dilutive common stock options excluded from net income (loss) per share, diluted (in shares) 7   7   7 7