Note 3 - Stock-based Compensation - RSU Summary (Details) shares in Thousands	9 Months Ended
	Sep. 30, 2025 $ / shares shares
Time-Based RSUs [Member]
Balance (in shares) | shares	85
Outstanding, weighted average (in dollars per share) | $ / shares	$ 516.12
Granted (in shares) | shares	38
Granted, weighted average (in dollars per share) | $ / shares	$ 650.32
Vested (in shares) | shares	(33)
Vested, weighted average (in dollars per share) | $ / shares	$ 477.06
Forfeited (in shares) | shares	(5)
Forfeited, weighted average (in dollars per share) | $ / shares	$ 565.8
Balance (in shares) | shares	85
Outstanding, weighted average (in dollars per share) | $ / shares	$ 589.21
PSUs and MPSUs [Member]
Balance (in shares) | shares	681
Outstanding, weighted average (in dollars per share) | $ / shares	$ 524.08
Granted (in shares) | shares	274	[1]
Granted, weighted average (in dollars per share) | $ / shares	$ 564.69
Vested (in shares) | shares	(40)
Vested, weighted average (in dollars per share) | $ / shares	$ 400.9
Forfeited (in shares) | shares	(4)
Forfeited, weighted average (in dollars per share) | $ / shares	$ 526.65
Balance (in shares) | shares	911
Outstanding, weighted average (in dollars per share) | $ / shares	$ 541.13
MSUs [Member]
Balance (in shares) | shares	938
Outstanding, weighted average (in dollars per share) | $ / shares	$ 203.32
Granted (in shares) | shares	0
Granted, weighted average (in dollars per share) | $ / shares	$ 0
Vested (in shares) | shares	0
Vested, weighted average (in dollars per share) | $ / shares	$ 0
Forfeited (in shares) | shares	(11)
Forfeited, weighted average (in dollars per share) | $ / shares	$ 297.45
Balance (in shares) | shares	927
Outstanding, weighted average (in dollars per share) | $ / shares	$ 202.25
Time-Based RSUs PSUs MSUs [Member]
Balance (in shares) | shares	1,704
Outstanding, weighted average (in dollars per share) | $ / shares	$ 347.01
Granted (in shares) | shares	312
Granted, weighted average (in dollars per share) | $ / shares	$ 574.95
Vested (in shares) | shares	(73)
Vested, weighted average (in dollars per share) | $ / shares	$ 435.39
Forfeited (in shares) | shares	(20)
Forfeited, weighted average (in dollars per share) | $ / shares	$ 413.13
Balance (in shares) | shares	1,923
Outstanding, weighted average (in dollars per share) | $ / shares	$ 379.76

[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.