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Note 12 - Equity Compensation Plans - Summary of Stock Activity (Details) - USD ($)
$ / shares in Units, $ in Millions
 3 Months Ended
Jan. 15, 2021
Mar. 31, 2021
Mar. 31, 2021
Dec. 31, 2020
Outstanding beginning balance, options (in shares)   5,611,777    
Outstanding beginning balance, options, weighted average exercise price (in dollars per share)   $ 98.28    
Outstanding, options, aggregate intrinsic value     $ 416.8 $ 613.4
Granted, options (in shares) 706,507 709,811    
Granted, options, weighted average exercise price (in dollars per share)   $ 190.10    
Dividend reinvestment, options (in shares)   0    
Dividend reinvestment, options, weighted average exercise price (in (in dollars per share)   $ 0    
Exercised or lapsed, options (in shares)   (115,284)    
Exercised or lapsed, options, weighted average exercise price (in dollars per share)   $ 64.73    
Exercised or lapsed, options, aggregate intrinsic value   $ 13.5    
Canceled, expired or forfeited, option (in shares)   (20,245)    
Canceled, expired or forfeited, options, weighted average exercise price (in dollars per share)   $ 136.35    
Outstanding, option (in shares)   6,186,059    
Outstanding beginning balance, options, weighted average exercise price (in dollars per share)   $ 109.31    
Exercisable, options (in shares)     3,588,921 3,494,164
Exercisable, options, weighted average exercise price (in dollars per share)     $ 82.06 $ 76.84
Exercisable, options, aggregate intrinsic value     $ 339.6 $ 456.9
Nonvested, options (in shares)     2,597,138  
Expected to vest, options (in shares)     2,296,123  
Restricted Stock [Member]        
Outstanding beginning balance, number of shares (in shares)   390,054    
Outstanding beginning balance, weighted average exercise price (in dollars per share)   $ 131.63    
Granted, number of shares (in shares) 134,777 135,380    
Granted, weighted average exercise price (in dollars per share)   $ 190.10    
Dividend reinvestment, number of shares (in shares)   0    
Dividend reinvestment (in dollars per share)   $ 0    
Exercised or lapsed, number of shares (in shares)   (36,637)    
Exercised or lapsed, weighted average exercise price (in dollars per share)   $ 158.23    
Canceled, expired or forfeited, number of shares (in shares)   (3,216)    
Canceled, expired or forfeited, weighted average exercise price (in dollars per share)   $ 141.28    
Outstanding ending balance, number of shares (in shares)   485,581    
Outstanding ending balance, weighted average exercise price (in dollars per share)   $ 145.47    
Nonvested, number of shares (in shares)   485,581 485,581 390,054
Expected, number of shares (in shares)     432,880  
Performance Shares [Member]        
Outstanding beginning balance, number of shares (in shares)   145,609    
Outstanding beginning balance, weighted average exercise price (in dollars per share)   $ 170.75    
Granted, number of shares (in shares) 59,144 59,144    
Granted, weighted average exercise price (in dollars per share)   $ 210.07    
Dividend reinvestment, number of shares (in shares)   269    
Exercised or lapsed, number of shares (in shares)   (42,610)    
Canceled, expired or forfeited, number of shares (in shares)   0    
Outstanding ending balance, number of shares (in shares)   162,412    
Outstanding ending balance, weighted average exercise price (in dollars per share)   $ 192.99    
Nonvested, number of shares (in shares)   162,412 162,412 145,609
Expected, number of shares (in shares) [1]     115,599  
[1] Includes estimated performance achievement