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Note 17 - Compensation Plans - Summary of Stock Activity (Details) - USD ($)
$ / shares in Units, $ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Outstanding beginning balance, options (in shares) 6,432,814 6,820,046 8,907,109        
Outstanding beginning balance, options, weighted average exercise price (in dollars per share) $ 79.51 $ 67.27 $ 53.31        
Outstanding, options, aggregate intrinsic value       $ 613.4 $ 449.2 $ 284.9 $ 380.2
Number of options, granted (in shares) 936,843 920,398 958,332        
Granted, options, weighted average exercise price (in dollars per share) $ 159.28 $ 135.64 $ 104.23        
Exercised or lapsed, options (in shares) (1,623,740) (1,131,970) (2,752,735)        
Exercised or lapsed, options, weighted average exercise price (in dollars per share) $ 56.83 $ 51.20 $ 33.00        
Exercised or lapsed, options, aggregate intrinsic value $ 189.8 $ 101.0 $ 213.0        
Canceled, expired or forfeited, option (in shares) (134,140) (175,660) (292,660)        
Canceled, expired or forfeited, options, weighted average exercise price (in dollars per share) $ 125.95 $ 92.27 $ 79.16        
Outstanding beginning balance, options, weighted average exercise price (in dollars per share) $ 98.28 $ 79.51 67.27        
Dividend reinvestment, options (in shares) 0 0          
Dividend reinvestment, options, weighted average exercise price (in (in dollars per share) $ 0 $ 0          
Outstanding beginning balance, options, weighted average exercise price (in dollars per share) $ 98.28 $ 79.51 $ 67.27 $ 98.28 $ 79.51 $ 67.27 $ 53.31
Outstanding, option (in shares) 5,611,777 6,432,814 6,820,046        
Exercisable, options (in shares)       3,494,164 4,175,855    
Exercisable, options, weighted average exercise price (in dollars per share)       $ 76.84 $ 65.05    
Exercisable, options, aggregate intrinsic value       $ 456.9 $ 352.0    
Nonvested, options (in shares)       2,117,613 2,256,959 2,459,929 2,911,770
Expected to vest, options (in shares)       1,900,586      
Restricted Stock [Member]              
Outstanding beginning balance, number of shares (in shares) 428,729 533,335 604,464        
Outstanding beginning balance, weighted average exercise price (in dollars per share) $ 107.96 $ 88.55 $ 78.28        
Granted, number of shares (in shares) 163,441 167,231 207,041        
Granted, weighted average exercise price (in dollars per share) $ 159.96 $ 135.82 $ 104.34        
Exercised or lapsed, number of shares (in shares) (178,317) (242,815) (225,205)        
Exercised or lapsed, weighted average exercise price (in dollars per share) $ 102.00 $ 84.60 $ 76.88        
Canceled, expired or forfeited, number of shares (in shares) (23,799) (29,022) (52,965)        
Canceled, expired or forfeited, weighted average exercise price (in dollars per share) $ 124.40 $ 109.72 $ 82.64        
Outstanding ending balance, number of shares (in shares) 390,054 428,729 533,335        
Outstanding ending balance, weighted average exercise price (in dollars per share) $ 131.63 $ 107.96 $ 88.55        
Dividend reinvestment, number of shares (in shares) 0 0          
Dividend reinvestment (in dollars per share) $ 0 $ 0          
Outstanding ending balance, number of shares (in shares) 390,054 428,729 533,335 390,054 428,729 533,335 604,464
Outstanding ending balance, weighted average exercise price (in dollars per share) $ 131.63 $ 107.96 $ 88.55 $ 131.63 $ 107.96 $ 88.55 $ 78.28
Expected, number of shares (in shares)       354,959      
Performance Shares [Member]              
Outstanding beginning balance, number of shares (in shares) 93,960 42,050 0        
Outstanding beginning balance, weighted average exercise price (in dollars per share) $ 158.50 $ 140.70 $ 0        
Granted, number of shares (in shares) 50,736 51,792 46,705        
Granted, weighted average exercise price (in dollars per share) $ 192.93 $ 173.59 $ 140.70        
Exercised or lapsed, number of shares (in shares) 0 0 0        
Exercised or lapsed, weighted average exercise price (in dollars per share)   $ 0          
Canceled, expired or forfeited, number of shares (in shares) 0 (432) (4,655)        
Canceled, expired or forfeited, weighted average exercise price (in dollars per share)   $ 134.24 $ 140.70        
Outstanding ending balance, number of shares (in shares) 102,999 93,960 42,050        
Outstanding ending balance, weighted average exercise price (in dollars per share) $ 170.75 $ 158.50 $ 140.70        
Dividend reinvestment, number of shares (in shares) 913 550          
Outstanding ending balance, number of shares (in shares) 102,999 93,960 42,050 102,999 93,960 42,050 0
Outstanding ending balance, weighted average exercise price (in dollars per share) $ 170.75 $ 158.50 $ 140.70 $ 170.75 $ 158.50 $ 140.70 $ 0
Outstanding at December 31, 2020 (in shares)       145,609      
Expected, number of shares (in shares) [1]       268,294      
[1] Includes estimated performance achievement