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Note 4 - Stock-based Compensation - Summary of Stock Option Activity (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Millions
3 Months Ended 12 Months Ended
Mar. 31, 2022
Dec. 31, 2021
Outstanding, Options (in shares) 2,106  
Outstanding, weighted average exercise price (in dollars per share) $ 149.84  
Outstanding, Weighted-Average Remaining Contractual Term (Year) 6 years 9 months 18 days 6 years 3 months 18 days
Outstanding, Aggregate Intrinsic Value $ 222 $ 215
Granted, Options (in shares) 328  
Granted, weighted average exercise price (in dollars per share) $ 244.35  
Exercised, Options (in shares) (322)  
Exercised, weighted average exercise price (in dollars per share) $ 127.49  
Forfeited or expired, Options (in shares) (6)  
Forfeited or expired, weighted average exercise price (in dollars per share) $ 206.59  
Outstanding, Options (in shares) 2,106 2,106
Outstanding, weighted average exercise price (in dollars per share) $ 167.82 $ 149.84
Vested or expected to vest, Options (in shares) 2,086  
Vested or expected to vest, weighted average exercise price (in dollars per share) $ 167.27  
Vested or expected to vest, Weighted-Average Remaining Contractual Term (Year) 6 years 9 months 18 days  
Vested or expected to vest, Aggregate Intrinsic Value $ 221  
Exercisable, Options (in shares) 1,407  
Options, exercisable, Weighted-Average Exercise Price (in dollars per share) $ 142.05  
Options, Exercisable, Weighted-Average Remaining Contractual Term (Year) 5 years 7 months 6 days  
Options, Exercisable, Aggregate Intrinsic Value $ 185