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Note 8 - Share-based Compensation - Summary of Stock Option Activity (Details) - Employee and Nonemployee Stock Option [Member]
$ / shares in Units, $ in Thousands
 9 Months Ended
Sep. 30, 2024
USD ($)
$ / shares
shares
Outstanding, options (in shares) | shares 78,488
Outstanding, weighted average exercise price (in dollars per share) | $ / shares $ 39.98
Granted, options (in shares) | shares 2,958
Granted, weighted average exercise price (in dollars per share) | $ / shares $ 260.92
Exercised, options (in shares) | shares (6,568)
Exercised, weighted average exercise price (in dollars per share) | $ / shares $ 32.35
Outstanding, options (in shares) | shares 74,878
Outstanding, weighted average exercise price (in dollars per share) | $ / shares $ 67.67
Outstanding, weighted average remaining life (Year) 5 years 2 months 1 day
Outstanding, intrinsic value | $ $ 18,669
Exercisable, options (in shares) | shares 67,952
Exercisable, weighted average exercise price (in dollars per share) | $ / shares $ 56.36
Exercisable, weighted average remaining life (Year) 5 years 29 days
Exercisable, intrinsic value | $ $ 17,690
Vested and expected to vest, options (in shares) | shares 74,878
Vested and expected to vest, weighted average exercise price (in dollars per share) | $ / shares $ 67.67
Vested and expected to vest, weighted average remaining life (Year) 5 years 2 months 1 day
Vested and expected to vest, intrinsic value | $ $ 18,669