Note 6 - Share-based Compensation (Tables)

9 Months Ended

Sep. 30, 2019

Notes Tables

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

	2019			2018
Expected dividend yield at date of grant		2.60	%		2.59	%
Expected stock price volatility		34.01	%		32.47	%
Risk-free interest rate		2.38	%		2.51	%
Expected life of options (in years)		7.5			7.3

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

	Number of Options			Weighted Average Exercise Price		Weighted Average Remaining Contractual Terms (Years)		Aggregate Intrinsic Value (In thousands)
Outstanding at December 31, 2018		1,373,209		$	15.99
Granted		100,615		$	41.64
Exercised		(177,090	)	$	12.96			$	6,548
Forfeited		--		$	--
Outstanding at September 30, 2019		1,296,734		$	18.39		4.81	$	51,038
Exercisable at September 30, 2019		858,349		$	15.02		3.52	$	36,675

Schedule of Nonvested Share Activity [Table Text Block]

	Common Shares Outstanding		Weighted Average Grant Date Fair Value Per Share
Outstanding at December 31, 2018		78,171	$	15.61
Granted		6,005		38.30
Vested		--		--
Forfeited		--	$	--
Outstanding at September 30, 2019		84,176	$	17.23