Note 3 - Stock-based Compensation - RSU Summary (Details) shares in Thousands	6 Months Ended
	Jun. 30, 2024 $ / shares shares
Time-Based RSUs [Member]
Balance (in shares) | shares	102
Outstanding, weighted average (in dollars per share) | $ / shares	$ 411.11
Granted (in shares) | shares	30
Granted, weighted average (in dollars per share) | $ / shares	$ 635.67
Vested (in shares) | shares	(31)
Vested, weighted average (in dollars per share) | $ / shares	$ 363.82
Forfeited (in shares) | shares	(3)
Forfeited, weighted average (in dollars per share) | $ / shares	$ 465.22
Balance (in shares) | shares	98
Outstanding, weighted average (in dollars per share) | $ / shares	$ 493.16
PSUs and MPSUs [Member]
Balance (in shares) | shares	482
Outstanding, weighted average (in dollars per share) | $ / shares	$ 397,770
Granted (in shares) | shares	344	[1]
Granted, weighted average (in dollars per share) | $ / shares	$ 593.33
Vested (in shares) | shares	(77)
Vested, weighted average (in dollars per share) | $ / shares	$ 307.93
Forfeited (in shares) | shares	(1)
Forfeited, weighted average (in dollars per share) | $ / shares	$ 396.4
Balance (in shares) | shares	748
Outstanding, weighted average (in dollars per share) | $ / shares	$ 496.84
MSUs [Member]
Balance (in shares) | shares	1,502
Outstanding, weighted average (in dollars per share) | $ / shares	$ 152.89
Granted (in shares) | shares	0
Granted, weighted average (in dollars per share) | $ / shares	$ 0
Vested (in shares) | shares	(563)
Vested, weighted average (in dollars per share) | $ / shares	$ 68.48
Forfeited (in shares) | shares	(1)
Forfeited, weighted average (in dollars per share) | $ / shares	$ 270.15
Balance (in shares) | shares	938
Outstanding, weighted average (in dollars per share) | $ / shares	$ 203.33
Time-Based RSUs PSUs MSUs [Member]
Balance (in shares) | shares	2,086
Outstanding, weighted average (in dollars per share) | $ / shares	$ 222.04
Granted (in shares) | shares	374
Granted, weighted average (in dollars per share) | $ / shares	$ 596.68
Vested (in shares) | shares	(671)
Vested, weighted average (in dollars per share) | $ / shares	$ 109.62
Forfeited (in shares) | shares	(5)
Forfeited, weighted average (in dollars per share) | $ / shares	$ 412.4
Balance (in shares) | shares	1,784
Outstanding, weighted average (in dollars per share) | $ / shares	$ 342.19

[1] Amount reflects the number of awards that may ultimately be earned based on management's probability assessment of the achievement of performance conditions at each reporting period.