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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 9 Months Ended
Sep. 30, 2025
Jun. 30, 2025
Mar. 31, 2025
Sep. 30, 2024
Jun. 30, 2024
Mar. 31, 2024
Sep. 30, 2025
Sep. 30, 2024
Net income (loss) $ (10,807) $ (44,224) $ (23,403) $ (27,943) $ 6,155 $ 25,043 $ (78,434) $ 3,255
Weighted average common shares outstanding (in shares) 48,308     47,976     48,293 45,734
Net income (loss) per share, basic (in dollars per share) $ (0.22)     $ (0.58)     $ (1.62) $ 0.07
Adjustment for change in fair value of warrant liabilities $ 0     $ 0     $ 0 $ (43,793)
Adjusted numerator, diluted $ (10,807)     $ (27,943)     $ (78,434) $ (40,538)
Dilutive effect of common stock warrants (in shares) 0     0     0 367
Weighted average dilutive common shares (in shares) 48,308     47,976     48,293 46,101
Net loss per share, diluted (in dollars per share) $ (0.22)     $ (0.58)     $ (1.62) $ (0.88)
Share-Based Payment Arrangement, Option [Member]                
Dilutive common stock options excluded from net income (loss) per share, diluted (in shares) 4,101     2,949     3,975 2,772
Warrant [Member]                
Dilutive common stock options excluded from net income (loss) per share, diluted (in shares) 7     7     7 7