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Note 12 - Equity Compensation Plans (Tables)

3 Months Ended

Mar. 31, 2021

Notes Tables

Share-based Payment Arrangement, Option, Activity [Table Text Block]

		Stock Option												Restricted Stock								PSU
		Number of Shares				Weighted Average Exercise Price				Aggregate Intrinsic Value				Number of Shares				Weighted Average Grant Date Fair Value Per Share				Number of Shares				Weighted Average Grant Date Fair Value Per Share
										(in millions)
Outstanding at December 31, 2020			5,611,777			$	98.28			$	613.4				390,054			$	131.63				145,609			$	170.75
Granted			709,811			$	190.10								135,380			$	190.10				59,144			$	210.07
Dividend reinvestment			—			$	—								—			$	—				269				N/A
Exercised or lapsed			(115,284	)		$	64.73			$	13.5				(36,637	)		$	158.23				(42,610	)		$	140.70
Canceled, expired or forfeited			(20,245	)		$	136.35								(3,216	)		$	141.28				—
Outstanding at March 31, 2021			6,186,059			$	109.31			$	416.8				485,581			$	145.47				162,412			$	192.99
Exercisable at March 31, 2021			3,588,921			$	82.06			$	339.6
Exercisable at December 31, 2020			3,494,164			$	76.84			$	456.9
Nonvested at March 31, 2021			2,597,138												485,581								162,412
Expected to vest at March 31, 2021			2,296,123												432,880								115,599	(1)

Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions [Table Text Block]

		2021				2020
Option pricing model			Black-Scholes				Black-Scholes
Expected volatility			23.60	%			18.17	%
Risk-free interest rate			0.37	%			1.59	%
Expected term in years			4.3				4.3
Dividend yield			0.63	%			0.71	%
Weighted average grant date fair value per stock option		$	36.09			$	25.49

X

- Definition

Tabular disclosure for stock option plans. Includes, but is not limited to, outstanding awards at beginning and end of year, grants, exercises, forfeitures, and weighted-average grant date fair value.

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