Note 4 - Securities (Tables)

12 Months Ended

Dec. 31, 2015

Investments, Debt and Equity Securities [Abstract]

Schedule of Available-for-sale Securities Reconciliation [Table Text Block]

	As of December 31, 2015
			Gross		Gross
	Amortized		Unrealized		Unrealized			Estimated
(Amounts in thousands)	Costs		Gains		Losses			Fair Value
Available-for-sale securities:
U.S. government & agencies	$	3,886	$	57	$	—		$	3,943
Obligations of state and political subdivisions		59,332		1,811		(39	)		61,104
Residential mortgage backed securities and collateralized mortgage obligations		32,215		192		(270	)		32,137
Corporate securities		33,775		194		(191	)		33,778
Commercial mortgage backed securities		12,893		10		(134	)		12,769
Other asset backed securities		15,331		82		(114	)		15,299
Total	$	157,432	$	2,346	$	(748	)	$	159,030
Held-to-maturity securities:
Obligations of state and political subdivisions	$	35,899	$	966	$	(220	)	$	36,645

	As of December 31, 2014
			Gross		Gross
	Amortized		Unrealized		Unrealized			Estimated
(Amounts in thousands)	Costs		Gains		Losses			Fair Value
Available-for-sale securities:
U.S. government & agencies	$	6,351	$	58	$	(16	)	$	6,393
Obligations of state and political subdivisions		52,629		1,788		(54	)		54,363
Residential mortgage backed securities and collateralized mortgage obligations		46,727		457		(169	)		47,015
Corporate securities		37,392		475		(133	)		37,734
Commercial mortgage backed securities		10,402		60		(73	)		10,389
Other asset backed securities		30,896		393		(197	)		31,092
Total	$	184,397	$	3,231	$	(642	)	$	186,986
Held-to-maturity securities:
Obligations of state and political subdivisions	$	36,806	$	712	$	(400	)	$	37,118

Amortized Cost and Estimated Fair Value Available for Sale Securities Table [Text Block]

	Available-For-Sale				Held-To-Maturity
(Amounts in thousands)	Amortized Cost		Fair Value		Amortized Cost		Fair Value
Amounts maturing in:
One year or less	$	6,429	$	6,439	$	—	$	—
One year through five years		49,413		49,535		1,518		1,554
Five years through ten years		54,263		55,326		16,415		16,887
After ten years		47,327		47,730		17,966		18,204
Total	$	157,432	$	159,030	$	35,899	$	36,645

Schedule of Financial Instruments Owned and Pledged as Collateral [Table Text Block]

(Amounts in thousands)	Pledged		Available To Be Pledged		Total Held For Pledging Purposes
Public funds collateral	$	17,883	$	11,221	$	29,104
Federal Home Loan Bank of San Francisco borrowings		—		15,565		15,565
Interest rate swap contracts		2,369		1,639		4,008
Total	$	20,252	$	28,425	$	48,677

Schedule of Realized Gain (Loss) [Table Text Block]

	For Years Ended December 31,
(Amounts in thousands)	2015			2014			2013
Proceeds from sales of securities	$	71,277		$	93,545		$	103,303
Gross realized gains on sales of securities:
U.S. government & agencies	$	—		$	32		$	—
Obligations of state and political subdivisions		97			268			261
Residential mortgage backed securities and collateralized mortgage obligations		142			102			250
Corporate securities		161			317			1,022
Commercial mortgage backed securities		14			4			—
Other asset backed securities		142			73			52
Total gross realized gains on sales of securities		556			796			1,585
Gross realized losses on sales of securities
U.S. government & agencies		(4	)		(114	)		(100	)
Obligations of state and political subdivisions		(29	)		(209	)		(215	)
Residential mortgage backed securities and collateralized mortgage obligations		(12	)		(570	)		(199	)
Corporate securities		(14	)		(8	)		(29	)
Commercial mortgage backed securities		—			(32	)		—
Other asset backed securities		(54	)		(22	)		(47	)
Total gross realized losses on sales of securities		(113	)		(955	)		(590	)
Gain (loss) on investment securities, net	$	443		$	(159	)	$	995

Schedule of Unrealized Loss on Investments [Table Text Block]

	As of December 31, 2015
	Less Than 12 Months					12 Months or More					Total
	Fair		Unrealized			Fair		Unrealized			Fair		Unrealized
(Amounts in thousands)	Value		Losses			Value		Losses			Value		Losses
Available-for-sale securities:
U.S. government & agencies	$	—	$	—		$	—	$	—		$	—	$	—
Obligations of states and political subdivisions		7,682		(39	)		—		—			7,682		(39	)
Residential mortgage backed securities and collateralized mortgage obligations		16,279		(210	)		4,931		(60	)		21,210		(270	)
Corporate securities		18,707		(191	)		—		—			18,707		(191	)
Commercial mortgage backed securities		7,557		(62	)		1,516		(72	)		9,073		(134	)
Other asset backed securities		4,734		(13	)		3,430		(101	)		8,164		(114	)
Total temporarily impaired securities	$	54,959	$	(515	)	$	9,877	$	(233	)	$	64,836	$	(748	)
Held-to-maturity securities:
Obligations of states and political subdivisions	$	1,513	$	(63	)	$	4,831	$	(157	)	$	6,344	$	(220	)

	As of December 31, 2014
	Less Than 12 Months					12 Months or More					Total
	Fair		Unrealized			Fair		Unrealized			Fair		Unrealized
(Amounts in thousands)	Value		Losses			Value		Losses			Value		Losses
Available-for-sale securities:
U.S. government & agencies	$	—	$	—		$	1,269	$	(16	)	$	1,269	$	(16	)
Obligations of states and political subdivisions		3,952		(34	)		2,078		(20	)		6,030		(54	)
Residential mortgage backed securities and collateralized mortgage obligations		10,193		(66	)		5,365		(103	)		15,558		(169	)
Corporate securities		7,058		(36	)		6,542		(97	)		13,600		(133	)
Commercial mortgage backed securities		4,912		(14	)		1,542		(59	)		6,454		(73	)
Other asset backed securities		4,891		(16	)		6,088		(181	)		10,979		(197	)
Total temporarily impaired securities	$	31,006	$	(166	)	$	22,884	$	(476	)	$	53,890	$	(642	)
Held-to-maturity securities:
Obligations of states and political subdivisions	$	1,556	$	(14	)	$	12,726	$	(386	)	$	14,282	$	(400	)