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Note 4 - Stock-based Compensation - Changes in Performance Retention Awards (Details) - Performance Retention Awards [Member]
shares in Thousands
9 Months Ended
Sep. 30, 2024
$ / shares
shares
Nonvested, beginning balance (in shares) | shares 617
Nonvested, weighted-average grant-date fair value, beginning balance (in dollars per share) | $ / shares $ 204.5
Granted (in shares) | shares 227
Granted, weighted average grant-date fair value (in dollars per share) | $ / shares $ 248.82
Vested (in shares) | shares (119)
Vested, weighted average grant-date fair value (in dollars per share) | $ / shares $ 204.67
Unearned (in shares) | shares (70)
Unearned, weighted average grant-date fair value (in dollars per share) | $ / shares $ 204.45
Forfeited (in shares) | shares (46)
Forfeited, weighted average grant-date fair value (in dollars per share) | $ / shares $ 228.59
Nonvested, ending balance (in shares) | shares 609
Nonvested, weighted-average grant-date fair value, ending balance (in dollars per share) | $ / shares $ 219.17