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Note 12 - Equity Compensation Plans (Tables)

6 Months Ended

Jun. 30, 2023

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
Outstanding at December 31, 2022			4,023,816			$	132.90			$	193.3				307,575			$	182.07				199,494				$	195.34
Granted			205,351			$	183.97								192,836			$	184.94				48,486				$	212.86
Dividend reinvestment			—			$	—								—			$	—				625					N/A
Exercised or lapsed			(1,049,105	)		$	108.83			$	86.7				(162,662	)		$	179.02				(45,997	)			$	192.93
Canceled, expired or forfeited			(197,034	)		$	187.69								(20,616	)		$	181.58				(18,487	)			$	205.58
Outstanding at June 30, 2023			2,983,028			$	141.26			$	252.9				317,133			$	185.93				184,121				$	199.70
Exercisable at June 30, 2023			2,208,396			$	125.45			$	222.2
Exercisable at December 31, 2022			2,702,075			$	110.02			$	182.6
Nonvested at June 30, 2023			774,632												317,133								184,121
Expected to vest at June 30, 2023			687,630												276,302								216,330		(1)

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

		2023				2022
Option pricing model		Black-Scholes				Black-Scholes
Expected volatility		27.36		%		25.29		%
Risk-free interest rate		3.74		%		1.47		%
Expected term in years		4.0				4.2
Dividend yield		0.66		%		0.60		%
Weighted average grant date fair value per stock option		$47.70				$42.18

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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