Note 7 - Stock-based Compensation (Tables)

3 Months Ended

Mar. 31, 2020

Notes Tables

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

	2020
Expected life of stock options (in years)		5.1
Risk free interest rate		1.68	%
Daily Volatility		26.0	%
Dividend yields		1.29	%
Weighted-average fair value of options granted during the three months ended March 31, 2020	$	5.92

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

	Shares			Weighted Average Exercise Price		Weighted Average Remaining Contractual Term in Years		Intrinsic Value
Options outstanding at January 1, 2020		302,385		$	17.73
Options granted		5,000		$	26.42
Options exercised		(12,050	)		6.68
Options outstanding at March 31, 2020		295,335		$	18.33		6.0	$	899,000
Options exercisable at March 31, 2020		122,785		$	12.89		4.2	$	899,000
Expected to vest after March 31, 2020		152,897		$	22.20		7.2	$	-