Note 4 - Investment Securities Available for Sale (Tables)

12 Months Ended

Dec. 31, 2014

Investment Holdings [Abstract]

Available-for-sale Securities [Table Text Block]

	2014
			Gross		Gross
	Amortized		Unrealized		Unrealized			Fair
	Cost		Gains		Losses			Value
U.S. Treasuries and Government agencies	$	77,550	$	7	$	(225	)	$	77,332
Municipal securities		58,812		456		(188	)		59,080
Mortgage-backed securities		36,920		900		(14	)		37,806
Total	$	173,282	$	1,363	$	(427	)	$	174,218

	2013
			Gross		Gross
	Amortized		Unrealized		Unrealized			Fair
	Cost		Gains		Losses			Value
Municipal securities	$	42,203	$	199	$	(478	)	$	41,924
Mortgage-backed securities		29,092		11		(199	)		28,904
Total	$	71,295	$	210	$	(677	)	$	70,828

Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value [Table Text Block]

	2014
	Less than 12 Months				12 Months or More				Total
	Fair		Unrealized		Fair		Unrealized		Fair		Unrealized
	Value		Losses		Value		Losses		Value		Losses
U.S. Treasuries and Government agencies	$	75,985	$	225	$	--	$	--	$	75,985	$	225
Municipal securities		16,353		171		1,028		17		17,381		188
Mortgage-backed securities		2,102		14		--		--		2,102		14
Total	$	94,440	$	410	$	1,028	$	17	$	95,468	$	427

	2013
	Less than 12 Months				12 Months or More				Total
	Fair		Unrealized		Fair		Unrealized		Fair		Unrealized
	Value		Losses		Value		Losses		Value		Losses
Municipal securities	$	17,851	$	424	$	945	$	54	$	18,796	$	478
Mortgage-backed securities		27,004		199		--		--		27,004		199
Total	$	44,855	$	623	$	945	$	54	$	45,800	$	677

Investments Classified by Contractual Maturity Date [Table Text Block]

	December 31, 2014
	Amortized		Fair		Weighted
	Cost		Value		Average Yield
Within one year	$	19,416	$	19,413		0.44%
Due from one year to five years		77,668		77,539		0.90%
Due from five years to ten years		22,602		22,777		3.81%
Due after ten years		16,676		16,683		3.16%
		136,362		136,412		1.41%
Mortgage-backed securities		36,920		37,806		2.78%
Total	$	173,282	$	174,218		1.71%

Realized Gain (Loss) on Investments [Table Text Block]

	2014		2013
Sales proceeds	$	4,374	$	12,169
Gross realized gains	$	31	$	47
Gross realized losses		--		(22	)
Net gains on sales of investment securities	$	31	$	25