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Note 7 - Share-based Compensation - Summary of Stock Option Activity (Details) - Employee and Nonemployee Stock Option [Member] - USD ($)
$ / shares in Units, $ in Thousands
 6 Months Ended
Jun. 30, 2024
Outstanding, options (in shares) 78,488
Outstanding, weighted average exercise price (in dollars per share) $ 39.98
Granted, options (in shares) 2,958
Granted, weighted average exercise price (in dollars per share) $ 260.92
Exercised, options (in shares) (6,568)
Exercised, weighted average exercise price (in dollars per share) $ 32.35
Outstanding, options (in shares) 74,878
Outstanding, weighted average exercise price (in dollars per share) $ 67.37
Outstanding, weighted average remaining life (Year) 5 years 5 months 1 day
Outstanding, intrinsic value $ 14,714
Exercisable, options (in shares) 67,952
Exercisable, weighted average exercise price (in dollars per share) $ 56.36
Exercisable, weighted average remaining life (Year) 5 years 3 months 29 days
Exercisable, intrinsic value $ 14,100
Vested and expected to vest, options (in shares) 74,878
Vested and expected to vest, weighted average exercise price (in dollars per share) $ 67.37
Vested and expected to vest, weighted average remaining life (Year) 5 years 5 months 1 day
Vested and expected to vest, intrinsic value $ 14,714