v3.23.1
Note 8 - Stock-based Compensation - Stock Option Activity (Details)
 3 Months Ended
Mar. 31, 2023
$ / shares
shares
Options outstanding (in shares) | shares 263,992
Options outstanding, weighted-average exercise price (in dollars per share) | $ / shares $ 79.07
Granted (in shares) | shares 134,647
Granted, weighted-average exercise price (in dollars per share) | $ / shares $ 33.84
Exercised (in shares) | shares 0
Exercised, weighted-average exercise price (in dollars per share) | $ / shares $ 0
Forfeited (in shares) | shares (15,061)
Forfeited, weighted-average exercise price (in dollars per share) | $ / shares $ 73.17
Expired (in shares) | shares (672)
Expired (in dollars per share) | $ / shares $ 108.33
Options outstanding (in shares) | shares 382,906
Options outstanding, weighted-average exercise price (in dollars per share) | $ / shares $ 63.34
Options exercisable (in shares) | shares 120,344
Options exercisable, weighted-average exercise price (in dollars per share) | $ / shares $ 89.42