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Note 7 - Stockholders' Equity and Stock-based Compensation - Stock Option Activity (Details) - USD ($)
$ / shares in Units, $ in Thousands
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Outstanding, options (in shares) 3,039,029  
Outstanding, options, weighted average exercise price (in dollars per share) $ 15.13  
Outstanding as of December 31, 2022, weighted average contractual term (Year) 7 years 7 months 9 days 6 years 2 months 15 days
Outstanding as of December 31, 2022, aggregate intrinsic value $ 300 $ 30,280
Options granted (in shares) 2,083,000  
Options granted, weighted average exercise price (in dollars per share) $ 26.65  
Options exercised (in shares) (240,147)  
Options exercised, weighted average exercise price (in dollars per share) $ 5.25  
Options forfeited/canceled (in shares) (418,854)  
Options forfeited/canceled, weighted average exercise price (in dollars per share) $ 24.64  
Outstanding, options (in shares) 4,463,028 3,039,029
Outstanding, options, weighted average exercise price (in dollars per share) $ 20.15 $ 15.13
Vested and expected to vest at December 31, 2024 (in shares) 3,965,665  
Vested and expected to vest at December 31, 2022, weighted average exercise price (in dollars per share) $ 19.93  
Vested and expected to vest at December 31, 2022, weighted average contractual term (Year) 7 years 5 months 8 days  
Vested and expected to vest at December 31, 2022, aggregate intrinsic value $ 300  
Exercisable at December 31, 2024 (in shares) 1,794,501  
Exercisable at December 31, 2022, weighted average exercise price (in dollars per share) $ 12.86  
Exercisable at December 31, 2022, weighted average contractual term (Year) 4 years 11 months 12 days  
Exercisable at December 31, 2022, aggregate intrinsic value $ 300