Note 3 - Allowance for Loan Losses, Nonperforming Assets and Impaired Loans - Past Due and Nonaccrual Loans (Details) - USD ($) $ in Thousands		Mar. 31, 2017		Dec. 31, 2016	Mar. 31, 2016
Loans past due 90 days or more and still accruing		$ 63	[1]	$ 63	$ 328
Nonaccruals (including impaired nonaccruals)		5,680	[1]	5,855	$ 6,405
Real Estate Construction Portfolio Segment[Member] | Construction Residential [Member]
Loans past due 90 days or more and still accruing		0	[1]	0
Nonaccruals (including impaired nonaccruals)		266	[1]	270
Real Estate Construction Portfolio Segment[Member] | Construction Other [Member]
Loans past due 90 days or more and still accruing				0
Nonaccruals (including impaired nonaccruals)				0
Consumer Real Estate Portfolio Segment [Member] | Equity Lines [Member]
Loans past due 90 days or more and still accruing		0	[1]	0
Nonaccruals (including impaired nonaccruals)		0	[1]	0
Consumer Real Estate Portfolio Segment [Member] | Closed End First Liens [Member]
Loans past due 90 days or more and still accruing		6	[1]	6
Nonaccruals (including impaired nonaccruals)		0	[1]
Consumer Real Estate Portfolio Segment [Member] | Closed End Junior Liens [Member]
Loans past due 90 days or more and still accruing		36	[1]	36
Nonaccruals (including impaired nonaccruals)		0	[1]	0
Consumer Real Estate Portfolio Segment [Member] | Investor Owned Residential Real Estate [Member]
Loans past due 90 days or more and still accruing		0	[1]	0
Nonaccruals (including impaired nonaccruals)		242	[1]	253
Commercial Real Estate Portfolio Segment [Member] | Multifamily Real Estate [Member]
Loans past due 90 days or more and still accruing		0	[1]	0
Nonaccruals (including impaired nonaccruals)		1,091	[1]	1,091
Commercial Real Estate Portfolio Segment [Member] | Commercial Real Estate, Owner Occupied [Member]
Loans past due 90 days or more and still accruing		0	[1]	0
Nonaccruals (including impaired nonaccruals)		1,178	[1]	1,183
Commercial Real Estate Portfolio Segment [Member] | Commercial Real Estate Other [Member]
Loans past due 90 days or more and still accruing		0	[1]	0
Nonaccruals (including impaired nonaccruals)		2,695	[1]	2,814
Commercial Non Real Estate Segment [Member] | Commercial and Industrial [Member]
Loans past due 90 days or more and still accruing	[1]	1
Nonaccruals (including impaired nonaccruals)	[1]	205
Commercial Portfolio Segment [Member] | Commercial and Industrial [Member]
Loans past due 90 days or more and still accruing				0
Nonaccruals (including impaired nonaccruals)				241
Consumer Non Real Estate Portfolio Segment [Member] | Credit Card Receivable [Member]
Loans past due 90 days or more and still accruing		1	[1]	5
Nonaccruals (including impaired nonaccruals)		0	[1]	0
Consumer Non Real Estate Portfolio Segment [Member] | Automobile Loan [Member]
Loans past due 90 days or more and still accruing		15	[1]	12
Nonaccruals (including impaired nonaccruals)		3	[1]	3
Consumer Non Real Estate Portfolio Segment [Member] | Other Consumer Loans [Member]
Loans past due 90 days or more and still accruing		4	[1]	4
Nonaccruals (including impaired nonaccruals)		0	[1]	0
Public Sector and IDA Portfolio Segment[Member]
Loans past due 90 days or more and still accruing				0
Nonaccruals (including impaired nonaccruals)				0
Financing Receivables 30 to 89 Days Past Due [Member]
Past due loans		2,158	[1]	2,553
Financing Receivables 30 to 89 Days Past Due [Member] | Real Estate Construction Portfolio Segment[Member] | Construction Residential [Member]
Past due loans		0	[1]	0
Financing Receivables 30 to 89 Days Past Due [Member] | Real Estate Construction Portfolio Segment[Member] | Construction Other [Member]
Past due loans				25
Financing Receivables 30 to 89 Days Past Due [Member] | Consumer Real Estate Portfolio Segment [Member] | Equity Lines [Member]
Past due loans		73	[1]	10
Financing Receivables 30 to 89 Days Past Due [Member] | Consumer Real Estate Portfolio Segment [Member] | Closed End First Liens [Member]
Past due loans		1,197	[1]	1,498
Financing Receivables 30 to 89 Days Past Due [Member] | Consumer Real Estate Portfolio Segment [Member] | Closed End Junior Liens [Member]
Past due loans		218	[1]	114
Financing Receivables 30 to 89 Days Past Due [Member] | Consumer Real Estate Portfolio Segment [Member] | Investor Owned Residential Real Estate [Member]
Past due loans			[1]	56
Financing Receivables 30 to 89 Days Past Due [Member] | Commercial Real Estate Portfolio Segment [Member] | Multifamily Real Estate [Member]
Past due loans			[1]	132
Financing Receivables 30 to 89 Days Past Due [Member] | Commercial Real Estate Portfolio Segment [Member] | Commercial Real Estate, Owner Occupied [Member]
Past due loans		270	[1]	339
Financing Receivables 30 to 89 Days Past Due [Member] | Commercial Real Estate Portfolio Segment [Member] | Commercial Real Estate Other [Member]
Past due loans		0	[1]	0
Financing Receivables 30 to 89 Days Past Due [Member] | Commercial Non Real Estate Segment [Member] | Commercial and Industrial [Member]
Past due loans	[1]	36
Financing Receivables 30 to 89 Days Past Due [Member] | Commercial Portfolio Segment [Member] | Commercial and Industrial [Member]
Past due loans				6
Financing Receivables 30 to 89 Days Past Due [Member] | Consumer Non Real Estate Portfolio Segment [Member] | Credit Card Receivable [Member]
Past due loans		10	[1]	8
Financing Receivables 30 to 89 Days Past Due [Member] | Consumer Non Real Estate Portfolio Segment [Member] | Automobile Loan [Member]
Past due loans		290	[1]	234
Financing Receivables 30 to 89 Days Past Due [Member] | Consumer Non Real Estate Portfolio Segment [Member] | Other Consumer Loans [Member]
Past due loans		64	[1]	131
Financing Receivables 30 to 89 Days Past Due [Member] | Public Sector and IDA Portfolio Segment[Member]
Past due loans				0
Financing Receivables, Equal to Greater than 90 Days Past Due [Member]
Past due loans		2,759	[1]	1,888
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Real Estate Construction Portfolio Segment[Member] | Construction Residential [Member]
Past due loans		0	[1]	0
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Real Estate Construction Portfolio Segment[Member] | Construction Other [Member]
Past due loans				0
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Consumer Real Estate Portfolio Segment [Member] | Equity Lines [Member]
Past due loans		0	[1]	0
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Consumer Real Estate Portfolio Segment [Member] | Closed End First Liens [Member]
Past due loans		6	[1]	6
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Consumer Real Estate Portfolio Segment [Member] | Closed End Junior Liens [Member]
Past due loans		36	[1]	36
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Consumer Real Estate Portfolio Segment [Member] | Investor Owned Residential Real Estate [Member]
Past due loans		242	[1]	234
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Commercial Real Estate Portfolio Segment [Member] | Multifamily Real Estate [Member]
Past due loans		1,091	[1]	1,091
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Commercial Real Estate Portfolio Segment [Member] | Commercial Real Estate, Owner Occupied [Member]
Past due loans		1,178	[1]	202
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Commercial Real Estate Portfolio Segment [Member] | Commercial Real Estate Other [Member]
Past due loans		0	[1]	80
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Commercial Non Real Estate Segment [Member] | Commercial and Industrial [Member]
Past due loans	[1]	186
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Commercial Portfolio Segment [Member] | Commercial and Industrial [Member]
Past due loans				218
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Consumer Non Real Estate Portfolio Segment [Member] | Credit Card Receivable [Member]
Past due loans		1	[1]	5
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Consumer Non Real Estate Portfolio Segment [Member] | Automobile Loan [Member]
Past due loans		15	[1]	12
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Consumer Non Real Estate Portfolio Segment [Member] | Other Consumer Loans [Member]
Past due loans		$ 4	[1]	4
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Public Sector and IDA Portfolio Segment[Member]
Past due loans				$ 0

[1] Only classes with past-due or nonaccrual loans are shown.