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Note 10 - Stock-based Compensation - Restricted Stock Options (Details) - Restricted Stock [Member]
 6 Months Ended
Jun. 30, 2022
$ / shares
shares
Restricted stock (in shares) | shares 343,782
Restricted stock, weighted-average grant date fair value (in dollars per share) | $ / shares $ 111.79
Granted (in shares) | shares 44,782
Granted, weighted-average grant date fair value (in dollars per share) | $ / shares $ 59.40
Restrictions lapsed (in shares) | shares (119,315)
Restrictions lapsed, weighted-average grant date fair value (in dollars per share) | $ / shares $ 105.06
Forfeited (in shares) | shares (32,814)
Forfeited, weighted-average grant date fair value (in dollars per share) | $ / shares $ 107.48
Restricted stock (in shares) | shares 236,435
Restricted stock, weighted-average grant date fair value (in dollars per share) | $ / shares $ 105.90