Note 5 - Allowance for Loan Losses, Nonperforming Assets and Impaired Loans (Details) - Past Due and Nonaccrual Loans - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Financing Receivable, Recorded Investment, Past Due [Line Items]
90 or more days past due and still accruing	$ 156	$ 207
Nonaccruals (including impaired nonaccruals)	6,682	9,287
Financing Receivables, 30 to 89 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past due loans	2,992	2,447
Financing Receivables, Equal to Greater than 90 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past due loans	3,124	2,302
Real Estate Construction Portfolio Segment[Member] | Construction Residential [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
90 or more days past due and still accruing	0	0
Nonaccruals (including impaired nonaccruals)	718	0
Real Estate Construction Portfolio Segment[Member] | Construction Residential [Member] | Financing Receivables, 30 to 89 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past due loans	0	0
Real Estate Construction Portfolio Segment[Member] | Construction Residential [Member] | Financing Receivables, Equal to Greater than 90 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past due loans	0	0
Real Estate Construction Portfolio Segment[Member] | Construction Other [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
90 or more days past due and still accruing	0	0
Nonaccruals (including impaired nonaccruals)	0	0
Real Estate Construction Portfolio Segment[Member] | Construction Other [Member] | Financing Receivables, 30 to 89 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past due loans	26	28
Real Estate Construction Portfolio Segment[Member] | Construction Other [Member] | Financing Receivables, Equal to Greater than 90 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past due loans	0	0
Consumer Real Estate Portfolio Segment [Member] | Equity Lines [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
90 or more days past due and still accruing	0	0
Nonaccruals (including impaired nonaccruals)	0	0
Consumer Real Estate Portfolio Segment [Member] | Equity Lines [Member] | Financing Receivables, 30 to 89 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past due loans	16	25
Consumer Real Estate Portfolio Segment [Member] | Equity Lines [Member] | Financing Receivables, Equal to Greater than 90 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past due loans	0	0
Consumer Real Estate Portfolio Segment [Member] | Closed-end First Liens [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
90 or more days past due and still accruing	106	80
Nonaccruals (including impaired nonaccruals)	14	105
Consumer Real Estate Portfolio Segment [Member] | Closed-end First Liens [Member] | Financing Receivables, 30 to 89 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past due loans	1,402	719
Consumer Real Estate Portfolio Segment [Member] | Closed-end First Liens [Member] | Financing Receivables, Equal to Greater than 90 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past due loans	106	185
Consumer Real Estate Portfolio Segment [Member] | Closed-end Junior Liens [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
90 or more days past due and still accruing	39	1
Nonaccruals (including impaired nonaccruals)	0	0
Consumer Real Estate Portfolio Segment [Member] | Closed-end Junior Liens [Member] | Financing Receivables, 30 to 89 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past due loans	123	74
Consumer Real Estate Portfolio Segment [Member] | Closed-end Junior Liens [Member] | Financing Receivables, Equal to Greater than 90 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past due loans	39	1
Consumer Real Estate Portfolio Segment [Member] | Investor-owned Residential Real Estate [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
90 or more days past due and still accruing	0	0
Nonaccruals (including impaired nonaccruals)	0	59
Consumer Real Estate Portfolio Segment [Member] | Investor-owned Residential Real Estate [Member] | Financing Receivables, 30 to 89 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past due loans	248	336
Consumer Real Estate Portfolio Segment [Member] | Investor-owned Residential Real Estate [Member] | Financing Receivables, Equal to Greater than 90 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past due loans	0	45
Commercial Real Estate Portfolio Segment [Member] | Multifamily Real Estate [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
90 or more days past due and still accruing	0	0
Nonaccruals (including impaired nonaccruals)	1,728	2,735
Commercial Real Estate Portfolio Segment [Member] | Multifamily Real Estate [Member] | Financing Receivables, 30 to 89 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past due loans	684	850
Commercial Real Estate Portfolio Segment [Member] | Multifamily Real Estate [Member] | Financing Receivables, Equal to Greater than 90 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past due loans	1,728	868
Commercial Real Estate Portfolio Segment [Member] | Commercial Real Estate, Owner Occupied [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
90 or more days past due and still accruing	0	102
Nonaccruals (including impaired nonaccruals)	494	2,573
Commercial Real Estate Portfolio Segment [Member] | Commercial Real Estate, Owner Occupied [Member] | Financing Receivables, 30 to 89 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past due loans	0	0
Commercial Real Estate Portfolio Segment [Member] | Commercial Real Estate, Owner Occupied [Member] | Financing Receivables, Equal to Greater than 90 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past due loans	357	1,066
Commercial Real Estate Portfolio Segment [Member] | Commercial Real Estate, Other [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
90 or more days past due and still accruing	0	0
Nonaccruals (including impaired nonaccruals)	2,845	3,066
Commercial Real Estate Portfolio Segment [Member] | Commercial Real Estate, Other [Member] | Financing Receivables, 30 to 89 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past due loans	0	0
Commercial Real Estate Portfolio Segment [Member] | Commercial Real Estate, Other [Member] | Financing Receivables, Equal to Greater than 90 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past due loans	0	70
Commercial Non Real Estate Segment [Member] | Commercial and Industrial [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
90 or more days past due and still accruing	0	0
Nonaccruals (including impaired nonaccruals)	883	749
Commercial Non Real Estate Segment [Member] | Commercial and Industrial [Member] | Financing Receivables, 30 to 89 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past due loans	142	153
Commercial Non Real Estate Segment [Member] | Commercial and Industrial [Member] | Financing Receivables, Equal to Greater than 90 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past due loans	883	43
Public Sector and IDA Portfolio Segment[Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
90 or more days past due and still accruing	0	0
Nonaccruals (including impaired nonaccruals)	0	0
Public Sector and IDA Portfolio Segment[Member] | Financing Receivables, 30 to 89 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past due loans	0	0
Public Sector and IDA Portfolio Segment[Member] | Financing Receivables, Equal to Greater than 90 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past due loans	0	0
Consumer Portfolio Segment [Member] | Credit Card Receivable [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
90 or more days past due and still accruing	6	4
Nonaccruals (including impaired nonaccruals)	0	0
Consumer Portfolio Segment [Member] | Credit Card Receivable [Member] | Financing Receivables, 30 to 89 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past due loans	5	3
Consumer Portfolio Segment [Member] | Credit Card Receivable [Member] | Financing Receivables, Equal to Greater than 90 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past due loans	6	4
Consumer Portfolio Segment [Member] | Automobile Loan [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
90 or more days past due and still accruing	5	20
Nonaccruals (including impaired nonaccruals)	0	0
Consumer Portfolio Segment [Member] | Automobile Loan [Member] | Financing Receivables, 30 to 89 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past due loans	286	205
Consumer Portfolio Segment [Member] | Automobile Loan [Member] | Financing Receivables, Equal to Greater than 90 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past due loans	5	20
Consumer Portfolio Segment [Member] | Other Consumer Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
90 or more days past due and still accruing	0	0
Nonaccruals (including impaired nonaccruals)	0	0
Consumer Portfolio Segment [Member] | Other Consumer Loans [Member] | Financing Receivables, 30 to 89 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past due loans	60	54
Consumer Portfolio Segment [Member] | Other Consumer Loans [Member] | Financing Receivables, Equal to Greater than 90 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past due loans	$ 0	$ 0