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Note 2 - Summary of Significant Accounting Policies - Calculation of Net Loss Per Share (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Net loss $ (90,973) $ (24,342) $ (97,217)
Weighted average common shares outstanding (in shares) 48,297 46,329 41,932
Net loss per share, basic (in dollars per share) $ (1.88) $ (0.53) $ (2.32)
Adjustment for change in fair value of warrant liabilities $ 0 $ (43,793) $ 0
Adjusted numerator, diluted $ (90,973) $ (68,135) $ (97,217)
Dilutive effect of common stock warrants (in shares) 0 275 0
Weighted average dilutive common shares (in shares) 48,297 46,604 41,932
Net loss per share, diluted (in dollars per share) $ (1.88) $ (1.46) $ (2.32)
Share-Based Payment Arrangement, Option [Member]      
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount (in shares) 3,940 3,154 2,123
Warrant [Member]      
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount (in shares) 7 7 7