Note 14 - Stock-based Compensation (Tables)

9 Months Ended

Sep. 30, 2022

Notes Tables

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

	September 30, 2022			December 31, 2021
Risk–free interest rate		1.84	%		0.21	%
Expected volatility		31.46	%		34.90	%
Expected life, in years		2.9			2.2
Expected dividend yield		3.57	%		3.00	%

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

	Number of Shares			Weighted Average Exercise Price		Aggregate Intrinsic Value
Options outstanding at January 1, 2021		866,956		$	72.11	$	–
Options granted		55,706			70.80		–
Options exercised		(541,736	)		71.39		–
Options cancelled		(6,000	)		72.94		–
Options outstanding at December 31, 2021		374,926			72.95		–
Options granted		301,386			65.02		–
Options exercised		(18,954	)		66.91		–
Options cancelled		(196,051	)		76.19		–
Options outstanding at September 30, 2022		461,307			66.63	$	44,582
Options exercisable at September 30, 2022		159,921			69.68	$	44,582

Share-Based Payment Arrangement, Option, Exercise Price Range [Table Text Block]

Options Outstanding September 30, 2022	Exercise Prices				Weighted Average Exercise Price		Weighted Average Remaining Contractual Life in Years
372,912		61.90	-	69.19		64.72		3.8
88,395		71.64	-	77.92		74.72		2.6
461,307						66.63		3.6