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Note 5 - Stockholders' Equity - Summary of PSU Transactions (Details) - Performance Shares [Member]
 9 Months Ended
Sep. 30, 2023
$ / shares
shares
Outstanding, shares (in shares) | shares 383,103
Outstanding, weighted average grant date fair value (in dollars per share) | $ / shares $ 37.62
Granted, shares (in shares) | shares 46,029
Granted, weighted average grant date fair value (in dollars per share) | $ / shares $ 51.36
Forfeited, shares (in shares) | shares (4,739)
Forfeited, weighted average grant date fair value (in dollars per share) | $ / shares $ 54.3
Non-vested, shares (in shares) | shares 424,393
Non-vested outstanding, weighted average grant date fair value (in dollars per share) | $ / shares $ 38.93