Note 13 - Stock-based Compensation (Tables)

9 Months Ended

Sep. 30, 2018

Notes Tables

Schedule of Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Table Text Block]

	For three months ended						For nine months ended
	September 30,						September 30,
(In thousands)	2018			2017			2018			2017
Stock-based compensation expense before income taxes	$	887		$	670		$	2,923		$	2,012
Less: deferred tax benefit		(186	)		(235	)		(614	)		(704	)
Reduction of net income	$	701		$	435		$	2,309		$	1,308

Schedule of Share-based Compensation Arrangement by Share-based Payment Award Fair Value Assumptions and Methodology [Table Text Block]

	2018			2017
Dividend yield		2.57	%		2.72	%
Expected volatility		20.60	%		19.47	%
Risk free interest rate		2.82	%		2.29	%
Expected life of SARs (in years)		7.0			7.0

Schedule of Share-based Compensation, Stock Options and Stock Appreciation Rights Award Activity [Table Text Block]

														Weighted
								Weighted		Aggregate		Weighted		average
	Options							average		intrinsic		average		remaining
	and SARs			Exercise				exercise		value		fair		contractual
	(In thousands)			price				price		(In thousands)		value		life (In years)
At December 31, 2016
Vested and exercisable		475		$	14.02	-	24.56	$	15.72	$	14,820	$	3.16		4.3
Unvested		260			15.24	-	33.08		21.53		6,623		3.43		7.8
Total outstanding		735			14.02	-	33.08		17.78		21,443		3.26		5.5
Granted		46			40.00	-	40.00		40.00		-		6.34
Exercised		(77	)		14.02	-	17.89		15.41		1,855		3.18
Forfeited		-					-		-		-		-
At December 31, 2017
Vested and exercisable		490			14.02	-	33.08		16.46		10,408		3.16		4.0
Unvested		214			15.26	-	40.00		26.46		2,515		4.17		7.7
Total outstanding		704			14.02	-	40.00		19.51		12,923		3.47		5.1
Granted		47			35.90	-	38.85		36.01		18		6.67
Exercised		(65	)		14.02	-	19.37		15.39		1,525		3.41
Forfeited		-					-		-		-		-
At September 30, 2018
Vested and exercisable		500			14.02	-	40.00		17.64		9,363		3.22		4.0
Unvested		187			19.37	-	40.00		30.14		1,293		4.97		7.8
Total outstanding		687			14.02	-	40.00		21.04		10,656		3.70		5.0
Vested year-to-date		75		$	15.26	-	40.00	$	23.35	$	1,006	$	3.77

Schedule of Nonvested Share Activity [Table Text Block]

				Grant date
				weighted-
	Number			average cost
Unvested at December 31, 2016		145,235		$	21.57
Shares awarded		28,625			44.85
Restrictions lapsed and shares released		(46,797	)		19.79
Shares forfeited		(7,691	)		25.18
Unvested at December 31, 2017		119,372			27.62
Shares awarded		38,680			36.03
Restrictions lapsed and shares released		(44,372	)		23.58
Shares forfeited		(4,637	)		30.93
Unvested at September 30, 2018		109,043		$	32.10

Schedule of Share-based Compensation, Restricted Stock Units Award Activity [Table Text Block]

	Vesting				Expected
Grant	period		Fair		shares to
year	in years		value		be awarded
2016		3	$	22.61		69,161
2017		3		35.66		61,893
2018		3		31.54		50,352