Note 12 - Stock-based Compensation (Tables)

12 Months Ended

Dec. 31, 2014

Note 12 - Stock-based Compensation (Tables) [Line Items]

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

	2014					2013					2012
				Weighted					Weighted					Weighted
				Average					Average					Average
	Shares			Fair Value		Shares			Fair Value		Shares			Fair Value
Nonvested at beginning of year		63,800		$	14.30		66,100		$	14.30		38,650		$	6.20
Granted		101,490			20.13		0		NA			66,100			14.30
Vested		(63,300	)		14.30		0		NA			(38,266	)		6.20
Forfeited		(500	)		14.30		(2,300	)		14.30		(384	)		6.20
Nonvested at end of year		101,490		$	20.13		63,800		$	14.30		66,100		$	14.30

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

	2014					2013					2012
				Weighted					Weighted					Weighted
				Average					Average					Average
				Exercise					Exercise					Exercise
	Shares			Price		Shares			Price		Shares			Price
Outstanding at beginning of year		60,876		$	33.11		152,896		$	26.15		214,903		$	22.40
Granted		6,488			22.15		0		NA			0		NA
Exercised		(2,845	)		17.74		(51,055	)		13.72		(50,930	)		10.83
Forfeited or expired		(29,184	)		34.60		(40,965	)		31.30		(11,077	)		23.77
Outstanding at end of year		35,335		$	31.09		60,876		$	33.11		152,896		$	26.15
Options exercisable at year-end		28,847		$	33.11		60,876		$	33.11		152,896		$	26.15

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

	2014
Risk-free interest rate		1.56	%
Expected option life (Years)		5
Expected stock price volatility		26	%
Dividend yield		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
$6.21	-	$ 8.00		2,700	0.9	$	6.21		2,700	$	6.21
$20.01	-	$24.00		6,488	6.9		22.15		0	NA
$32.01	-	$36.00		26,147	0.9		35.88		26,147		35.88
Outstanding at year end				35,335	2.0	$	31.09		28,847	$	33.11

			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		63,590	4.9	$	6.53		56,385	$	6.70
$8.01	-	$12.00		68,430	3.7		13.20		68,430		13.20
$20.01	-	$25.00		85,962	1.4		22.43		85,962		22.43
Outstanding at year end				217,982	3.1	$	14.89		210,777	$	15.22

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

	2014		2013		2012
Minimum exercise price	$	6.21	$	6.21	$	6.21
Maximum exercise price		35.88		40.28		40.28
Average remaining option term (Years)	2.0		1.4		1.9

	2014
Minimum exercise price	$	5.19
Maximum exercise price		24.46
Average remaining option term (Years)	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]

	2014		2013		2012
Aggregate intrinsic value of stock options exercised	$	11,000	$	408,000	$	307,000
Cash received from stock option exercises		50,000		289,000		227,000
Tax benefit realized from stock option exercises		0		0		0
Weighted average per share fair value of stock options granted	$	2.72		NA		NA

	2014
Aggregate intrinsic value of stock options exercised	$	333,000
Cash received from stock option exercises		232,000
Tax benefit realized from stock option exercises		116,000
Weighted average per share fair value of stock options granted	NA

Firstbank Plans [Member]

Note 12 - Stock-based Compensation (Tables) [Line Items]

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

	2014
				Weighted
				Average
				Exercise
	Shares			Price
Outstanding at beginning of year		0			0
Granted		0			0
Replaced as part of merger		282,178			15.48
Exercised		(27,740	)		8.34
Forfeited or expired		(36,456	)		24.46
Outstanding at end of year		217,982		$	14.89
Options exercisable at year-end		210,777		$	15.22