Note 13 - Stock-based Compensation (Tables)

6 Months Ended

Jun. 30, 2016

Notes Tables

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

	For three months ended						For six months ended
	June 30,						June 30,
(in thousands)	2016			2015			2016			2015
Stock-based compensation expense before income taxes	$	560		$	494		$	1,073		$	995
Less: deferred tax benefit		(196	)		(173	)		(376	)		(348	)
Reduction of net income	$	364		$	321		$	697		$	647

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 (in years)		7.3			7.5

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, 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		216		3.56
Exercised		(83	)	14.02	-	17.89		17.08		785		3.96
Forfeited		(1	)	15.24	-	15.84		15.47		8		2.90
At June 30, 2016
Vested and exercisable		664		14.02	-	22.96		15.82		8,238		3.29		3.9
Unvested		260		15.24	-	25.76		21.48		1,756		3.43		8.3
Total outstanding		924		14.02	-	25.76		17.41	$	9,994		3.33		5.1
Vested year-to-date		92		15.24	-	22.96		17.44	$	990		3.14

Schedule of Nonvested Share Activity [Table Text Block]

				Grant date
				weighted-
	Number			average cost
Unvested at December 31, 2014		171,139		$	16.63
Shares awarded		52,898			22.99
Restrictions lapsed and shares released to employees		(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 to employees		(48,290	)		17.91
Shares forfeited		(8,596	)		20.64
Unvested at June 30, 2016		150,094		$	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		31,887
2016		3		22.61		27,663