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Note 3 - Stock-based Compensation - Changes in Retention Awards (Details) - Retention Awards [Member]
shares in Thousands
6 Months Ended
Jun. 30, 2023
$ / shares
shares
Nonvested, beginning balance (in shares) | shares 1,069
Nonvested, weighted-average grant-date fair value, beginning balance (in dollars per share) | $ / shares $ 196.47
Granted (in shares) | shares 295
Granted, weighted-average grant-date fair value (in dollars per share) | $ / shares $ 202.72
Vested (in shares) | shares (300)
Vested, weighted-average grant-date fair value (in dollars per share) | $ / shares $ 162.65
Forfeited (in shares) | shares (25)
Forfeited, weighted-average grant-date fair value (in dollars per share) | $ / shares $ 205.20
Nonvested, ending balance (in shares) | shares 1,039
Nonvested, weighted-average grant-date fair value, ending balance (in dollars per share) | $ / shares $ 207.80