Note 12 - Stock-based Compensation (Tables)

12 Months Ended

Dec. 31, 2016

Notes Tables

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

	2016					2015					2014
	Shares			Weighted Average Fair Value		Shares			Weighted Average Fair Value		Shares			Weighted Average Fair Value
Nonvested at beginning of year		155,501		$	22.25		101,490		$	20.13		63,800		$	14.30
Granted		86,250			32.19		65,933			25.14		101,490			20.13
Vested		(7,622	)		20.23		(4,666	)		20.13		(63,300	)		14.30
Forfeited		(5,786	)		21.90		(7,256	)		20.13		(500	)		14.30
Nonvested at end of year		228,343		$	26.09		155,501		$	22.25		101,490		$	20.13

Schedule of Share-based Compensation, Stock Options, Activity [Table Text Block]

	2016					2015					2014
	Shares			Weighted Average Exercise Price		Shares			Weighted Average Exercise Price		Shares			Weighted Average Exercise Price
Outstanding at beginning of year		11,308		$	24.50		35,335		$	31.09		60,876		$	33.11
Granted		6,500			36.22		4,820			27.66		6,488			22.15
Exercised		(1,000	)		22.15		(2,700	)		6.21		(2,845	)		17.74
Forfeited or expired		0			NA		(26,147	)		35.88		(29,184	)		34.60
Outstanding at end of year		16,808		$	29.17		11,308		$	24.50		35,335		$	31.09
Options exercisable at year-end		5,488		$	22.15		0		$	NA		28,847		$	33.11

	2016					2015					2014
	Shares			Weighted Average Exercise Price		Shares			Weighted Average Exercise Price		Shares			Weighted Average Exercise Price
Outstanding at beginning of year		123,887		$	12.64		217,982		$	14.89		0		$	NA
Granted		0			NA		0			NA		0			NA
Replaced as part of merger		0			NA		0			NA		282,178			15.48
Exercised		(71,711	)		13.33		(56,417	)		15.50		(27,740	)		8.34
Forfeited or expired		(7,901	)		22.00		(37,678	)		21.39		(36,456	)		24.46
Outstanding at end of year		44,275		$	9.86		123,887		$	12.64		217,982		$	14.89
Options exercisable at year-end		44,275		$	9.86		123,887		$	12.64		210,777		$	15.22

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

	2016			2015			2014
Risk-free interest rate		1.78	%		1.67	%		1.56	%
Expected option life (years)		5			5			5
Expected stock price volatility		26	%		29	%		26	%
Dividend yield		2.5	%		2.5	%		2.5	%

Schedule of Share-based Compensation, Shares Authorized under Stock Option Plans, by Exercise Price Range [Table Text Block]

			Outstanding						Exercisable
					Weighted Average		Weighted				Weighted
Range of					Remaining		Average				Average
Exercise					Contractual		Exercise				Exercise
Prices			Number		Life (Years)		Price		Number		Price
$20.0 0	-	$24.00		5,488		4.9	$	22.15		5,488	$	22.15
$24.01	-	$28 .00		4,820		5.9		27.66		0		NA
$36.00	-	$40 .00		6,500		6.9		36.22		0		NA
Outstanding at year end				16,808		6.0	$	29.17		5,488	$	22.15

			Outstanding						Exercisable
					Weighted Average		Weighted				Weighted
Range of					Remaining		Average				Average
Exercise					Contractual		Exercise				Exercise
Prices			Number		Life (Years)		Price		Number		Price
$4.00	-	$8.00		23,975		2.2	$	6.73		23,975	$	6.73
$8.01	-	$12.00		6,700		2.7		8.60		6,700		8.60
$12.01	-	$16.0 0		13,600		0.7		16.00		13,600		16.00
Outstanding at year end				44,275		1.8	$	9.86		44,275	$	9.86

Schedule of Share-based Compensation Shares Authorized Under Stock Option Plans Information Related to Option Outstanding [Table Text Block]

	2016		2015		2014
Minimum exercise price	$	22.15	$	22.15	$	6.21
Maximum exercise price		36.22		27.66		35.88
Average remaining option term (years)		6.7		6.3		2.0

	2016		2015		2014
Minimum exercise price	$	5.19	$	5.19	$	5.19
Maximum exercise price		16.00		22.00		24.46
Average remaining option term (years)		1.8		2.7		3.1

Schedule of Share Based Compensation Arrangement by Share Based Payment Award Options Information Related to Stock Option Grants and Exercised [Table Text Block]

	2016		2015		2014
Aggregate intrinsic value of stock options exercised	$	6,000	$	36,000	$	11,000
Cash received from stock option exercises		22,000		17,000		50,000
Tax benefit realized from stock option exercises		0		0		0
Weighted average per share fair value of stock options granted		5.25		4.41		2.72

	2016		2015		2014
Aggregate intrinsic value of stock options exercised	$	1,945,000	$	420,000	$	333,000
Cash received from stock option exercises		956,000		874,000		232,000
Tax benefit realized from stock option exercises		681,000		147,000		116,000
Weighted average per share fair value of stock options granted		NA		NA		NA