Note 8 - Stock-based Compensation - RSU Summary (Details) - Time-based RSUs, PSUs and MSUs [Member] - $ / shares		12 Months Ended
		Dec. 31, 2025		Dec. 31, 2024	Dec. 31, 2023
Balance (in shares)		1,704		2,086,000	2,659,000
Outstanding, weighted average (in dollars per share)		$ 347.01		$ 222.04	$ 176.5
Granted (in shares)	[1]	317		402	363,000
Granted, weighted average (in dollars per share)		$ 576.98		$ 584.49	$ 444.86
Vested (in shares)		(1,226)	[2]	(778)	(911,000)
Vested, weighted average (in dollars per share)		$ 290.55		$ 133.62	$ 177.54
Forfeited (in shares)		(24)		(6)	(25,000)
Forfeited, weighted average (in dollars per share)		$ 473.09		$ 432.32	$ 209.23
Balance (in shares)		771		1,704	2,086,000
Outstanding, weighted average (in dollars per share)		$ 535.78		$ 347.01	$ 222.04

[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.

[2] Amount includes shares that had not been issued as of December 31, 2025.