Note 14 - Stock-based Compensation (Tables)

9 Months Ended

Sep. 30, 2016

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)	2016			2015			2016			2015
Stock-based compensation expense before income taxes	$	573		$	566		$	1,646		$	1,561
Less: deferred tax benefit		(200	)		(198	)		(576	)		(546	)
Reduction of net income	$	373		$	368		$	1,070		$	1,015

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

	2016			2015
Dividend yield		2.94	%		2.97	%
Expected volatility		19.31	%		22.81	%
Risk free interest rate		1.70	%		1.91	%
Expected life of SARs (years)		7.3			7.5

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

	Options and SARs (in thousands)			Exercise price				Weighted average exercise price		Aggregate intrinsic value (in thousands)		Weighted average fair value		Weighted average remaining contractual life (in years)
At December 31, 2015
Vested and exercisable		656		$	14.02	-	19.44	$	15.75	$	6,191	$	3.39		3.7
Unvested		266			15.24	-	24.55		18.66		1,733		3.29		7.7
Total outstanding		922			14.02	-	24.55		16.59		7,924		3.36		4.8
Granted		87				25.76			25.76		629		3.56
Exercised		(190	)		14.02	-	17.89		16.36		2,405		3.71
Forfeited		(3	)		14.02	-	15.84		15.18		33		2.94
At September 30, 2016
Vested and exercisable		556			14.02	-	24.56		15.83		9,533		3.25		4.0
Unvested		260			15.24	-	25.76		21.48		2,979		3.43		8.0
Total outstanding		816			14.02	-	25.76		17.63	$	12,512		3.31		5.3
Vested year-to-date		92			15.24	-	24.56		17.46	$	1,432		3.14

Schedule of Nonvested Share Activity [Table Text Block]

	Number			Grant date weighted- average cost
Unvested at December 31, 2014		171,139		$	16.63
Shares awarded		52,898			22.99
Restrictions lapsed and shares released		(61,205	)		15.89
Shares forfeited		(6,974	)		18.97
Unvested at December 31, 2015		155,858		$	18.98
Shares awarded		51,122			25.78
Restrictions lapsed and shares released		(48,711	)		17.94
Shares forfeited		(12,007	)		20.69
Unvested at September 30, 2016		146,262		$	21.55

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
2014		3	$	17.61		50,024
2015		3		20.02		36,337
2016		3		22.61		27,663