Note 3 - Stock-based Compensation - RSU Summary (Details) shares in Thousands	6 Months Ended
	Jun. 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	32
Granted, weighted average (in dollars per share) | $ / shares	$ 635.87
Vested (in shares) | shares	(27)
Vested, weighted average (in dollars per share) | $ / shares	$ 471.7
Forfeited (in shares) | shares	(4)
Forfeited, weighted average (in dollars per share) | $ / shares	$ 555.89
Balance (in shares) | shares	86
Outstanding, weighted average (in dollars per share) | $ / shares	$ 573.19
PSUs and MPSUs [Member]
Balance (in shares) | shares	681
Outstanding, weighted average (in dollars per share) | $ / shares	$ 524.08
Granted (in shares) | shares	269
Granted, weighted average (in dollars per share) | $ / shares	$ 565.99
Vested (in shares) | shares	(37)
Vested, weighted average (in dollars per share) | $ / shares	$ 399.91
Forfeited (in shares) | shares	(4)
Forfeited, weighted average (in dollars per share) | $ / shares	$ 524.36
Balance (in shares) | shares	909
Outstanding, weighted average (in dollars per share) | $ / shares	$ 540.24
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	(10)
Forfeited, weighted average (in dollars per share) | $ / shares	$ 297.97
Balance (in shares) | shares	928
Outstanding, weighted average (in dollars per share) | $ / shares	$ 202.27
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	301
Granted, weighted average (in dollars per share) | $ / shares	$ 573.03
Vested (in shares) | shares	(64)
Vested, weighted average (in dollars per share) | $ / shares	$ 430.1
Forfeited (in shares) | shares	(18)
Forfeited, weighted average (in dollars per share) | $ / shares	$ 399.27
Balance (in shares) | shares	1,923
Outstanding, weighted average (in dollars per share) | $ / shares	$ 378.58