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Note 5 - Stockholders' Equity - Summary of Stock Option Activity (Details) - USD ($)
$ / shares in Units, $ in Thousands
 6 Months Ended 12 Months Ended
Jun. 30, 2025
Dec. 31, 2024
Equity [Abstract]    
Outstanding, options (in shares) 588,385  
Outstanding, options, weighted average exercise price (in dollars per share) $ 33.76  
Outstanding, options, weighted average remaining contractual term (Year) 4 years 4 months 24 days 4 years 10 months 24 days
Outstanding, options, aggregate intrinsic value $ 53,407 $ 42,273
Options exercised, options (in shares) (77,599)  
Options exercised, options, weighted average exercise price (in dollars per share) $ 42.09  
Options cancelled (in shares) (342)  
Options cancelled (in dollars per share) $ 94.38  
Outstanding, options (in shares) 510,444 588,385
Outstanding, options, weighted average exercise price (in dollars per share) $ 32.45 $ 33.76
Vested and Exercisable, options (in shares) 510,024  
Vested and Exercisable, options, weighted average exercise price (in dollars per share) $ 32.41  
Vested and Exercisable, options, weighted average remaining contractual term (Year) 4 years 4 months 24 days  
Vested and Exercisable, options, aggregate intrinsic value $ 53,382