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Note 5 - Stockholders' Equity - Summary of RSU Transactions (Details) - Restricted Stock Units (RSUs) [Member]
 9 Months Ended
Sep. 30, 2023
$ / shares
shares
Outstanding, shares (in shares) | shares 271,951
Outstanding, weighted average grant date fair value (in dollars per share) | $ / shares $ 68.9
Granted, shares (in shares) | shares 157,972
Granted, weighted average grant date fair value (in dollars per share) | $ / shares $ 51.34
Released, shares (in shares) | shares (72,357)
Released, weighted average grant date fair value (in dollars per share) | $ / shares $ 66.37
Forfeited, shares (in shares) | shares (18,061)
Forfeited, weighted average grant date fair value (in dollars per share) | $ / shares $ 52.27
Non-vested, shares (in shares) | shares 339,505
Non-vested outstanding, weighted average grant date fair value (in dollars per share) | $ / shares $ 62.15