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Note 11 - Benefit Plans - Activity Related to Outstanding Stock Options (Details)
$ / shares in Units, $ in Thousands
 9 Months Ended 12 Months Ended
Sep. 30, 2024
USD ($)
$ / shares
shares
Dec. 31, 2023
USD ($)
$ / shares
shares
Beginning balance outstanding, number of options (in shares) | shares 1,092,343  
Beginning balance outstanding, weighted average exercise price per share (in dollars per share) | $ / shares $ 45.2  
Outstanding, weighted average remaining term (Year) 8 years 5 months 4 days 7 years 3 months 10 days
Outstanding, intrinsic value | $ $ 302  
Granted, number of options (in shares) | shares 918,849  
Granted, weighted average exercise price per share (in dollars per share) | $ / shares $ 7.04  
Granted, weighted average remaining term (Year) 9 years 8 months 19 days  
Exercised, number of options (in shares) | shares (41,090)  
Exercised, weighted average exercise price per share (in dollars per share) | $ / shares $ 3  
Exercised, intrinsic value | $ $ 65  
Forfeited, number of options (in shares) | shares (12,288)  
Forfeited, weighted average exercise price per share (in dollars per share) | $ / shares $ 88.26  
Expired, number of options (in shares) | shares (61,770)  
Expired, weighted average exercise price per share (in dollars per share) | $ / shares $ 0  
Ending balance outstanding, number of options (in shares) | shares 1,896,044 1,092,343
Ending balance outstanding, weighted average exercise price per share (in dollars per share) | $ / shares $ 28.76 $ 45.2
Outstanding, intrinsic value | $ $ 0 $ 302
Vested and exercisable, number of options (in shares) | shares 728,239  
Vested and exercisable, weighted average exercise price per share (in dollars per share) | $ / shares $ 51.48  
Vested and exercisable, weighted average remaining term (Year) 7 years 18 days  
Vested and exercisable, intrinsic value | $ $ 0  
Vested, exercisable and expected to vest, number of options (in shares) | shares 1,896,044  
Vested, exercisable and expected to vest, weighted average exercise price per share (in dollars per share) | $ / shares $ 28.76  
Vested, exercisable or expected to vest, weighted average remaining term (Year) 8 years 5 months 4 days  
Vested, exercisable or expected to vest, intrinsic value | $ $ 0