Note 4 - Allowance for Loan Losses, Nonperforming Assets and Impaired Loans - Past Due and Nonaccrual Loans (Details) - USD ($)	Mar. 31, 2016	Dec. 31, 2015	Mar. 31, 2015
Real Estate Construction Portfolio Segment[Member] | Construction Residential [Member]
Past due loans	$ 0	$ 0
Loans past due 90 days or more and still accruing	0	0
Nonaccruals (including impaired nonaccruals)	683,000	718,000
Real Estate Construction Portfolio Segment[Member] | Construction Other [Member]
Past due loans		0
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] | Financing Receivables 30 to 89 Days Past Due [Member]
Past due loans	9,000	16,000
Consumer Real Estate Portfolio Segment [Member] | Equity Lines [Member] | Financing Receivables, Equal to Greater than 90 Days Past Due [Member]
Past due loans	48,000	0
Consumer Real Estate Portfolio Segment [Member] | Equity Lines [Member]
Loans past due 90 days or more and still accruing	48,000	0
Nonaccruals (including impaired nonaccruals)	0	0
Consumer Real Estate Portfolio Segment [Member] | Closed End First Liens [Member] | Financing Receivables 30 to 89 Days Past Due [Member]
Past due loans	1,049,000	1,402,000
Consumer Real Estate Portfolio Segment [Member] | Closed End First Liens [Member] | Financing Receivables, Equal to Greater than 90 Days Past Due [Member]
Past due loans	239,000	106,000
Consumer Real Estate Portfolio Segment [Member] | Closed End First Liens [Member]
Loans past due 90 days or more and still accruing	239,000	106,000
Nonaccruals (including impaired nonaccruals)	0	14,000
Consumer Real Estate Portfolio Segment [Member] | Closed End Junior Liens [Member] | Financing Receivables 30 to 89 Days Past Due [Member]
Past due loans	290,000	123,000
Consumer Real Estate Portfolio Segment [Member] | Closed End Junior Liens [Member] | Financing Receivables, Equal to Greater than 90 Days Past Due [Member]
Past due loans	38,000	39,000
Consumer Real Estate Portfolio Segment [Member] | Closed End Junior Liens [Member]
Loans past due 90 days or more and still accruing	38,000	39,000
Nonaccruals (including impaired nonaccruals)	0	0
Consumer Real Estate Portfolio Segment [Member] | Investor Owned Residential Real Estate [Member] | Financing Receivables 30 to 89 Days Past Due [Member]
Past due loans	319,000	248,000
Consumer Real Estate Portfolio Segment [Member] | Investor Owned Residential Real Estate [Member] | Financing Receivables, Equal to Greater than 90 Days Past Due [Member]
Past due loans	0	0
Consumer Real Estate Portfolio Segment [Member] | Investor Owned Residential Real Estate [Member]
Loans past due 90 days or more and still accruing	0	0
Nonaccruals (including impaired nonaccruals)	11,000	0
Commercial Real Estate Portfolio Segment [Member] | Multifamily Real Estate [Member] | Financing Receivables 30 to 89 Days Past Due [Member]
Past due loans	676,000	684,000
Commercial Real Estate Portfolio Segment [Member] | Multifamily Real Estate [Member] | Financing Receivables, Equal to Greater than 90 Days Past Due [Member]
Past due loans	1,594,000	1,728,000
Commercial Real Estate Portfolio Segment [Member] | Multifamily Real Estate [Member]
Loans past due 90 days or more and still accruing	0	0
Nonaccruals (including impaired nonaccruals)	1,594,000	1,728,000
Commercial Real Estate Portfolio Segment [Member] | Commercial Real Estate, Owner Occupied [Member] | Financing Receivables 30 to 89 Days Past Due [Member]
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]
Past due loans	357,000	357,000
Commercial Real Estate Portfolio Segment [Member] | Commercial Real Estate, Owner Occupied [Member]
Loans past due 90 days or more and still accruing	0	0
Nonaccruals (including impaired nonaccruals)	485,000	494,000
Commercial Real Estate Portfolio Segment [Member] | Commercial Real Estate Other [Member] | Financing Receivables 30 to 89 Days Past Due [Member]
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]
Past due loans	0	0
Commercial Real Estate Portfolio Segment [Member] | Commercial Real Estate Other [Member]
Loans past due 90 days or more and still accruing	0	0
Nonaccruals (including impaired nonaccruals)	2,820,000	2,845,000
Commercial Non Real Estate Segment [Member] | Commercial and Industrial [Member] | Financing Receivables 30 to 89 Days Past Due [Member]
Past due loans	22,000	142,000
Commercial Non Real Estate Segment [Member] | Commercial and Industrial [Member] | Financing Receivables, Equal to Greater than 90 Days Past Due [Member]
Past due loans	812,000	883,000
Commercial Non Real Estate Segment [Member] | Commercial and Industrial [Member]
Loans past due 90 days or more and still accruing	0	0
Nonaccruals (including impaired nonaccruals)	812,000	883,000
Consumer Non Real Estate Portfolio Segment [Member] | Credit Card Receivable [Member] | Financing Receivables 30 to 89 Days Past Due [Member]
Past due loans	1,000	5,000
Consumer Non Real Estate Portfolio Segment [Member] | Credit Card Receivable [Member] | Financing Receivables, Equal to Greater than 90 Days Past Due [Member]
Past due loans	2,000	6,000
Consumer Non Real Estate Portfolio Segment [Member] | Credit Card Receivable [Member]
Loans past due 90 days or more and still accruing	2,000	6,000
Nonaccruals (including impaired nonaccruals)	0	0
Consumer Non Real Estate Portfolio Segment [Member] | Automobile Loan [Member] | Financing Receivables 30 to 89 Days Past Due [Member]
Past due loans	195,000	286,000
Consumer Non Real Estate Portfolio Segment [Member] | Automobile Loan [Member] | Financing Receivables, Equal to Greater than 90 Days Past Due [Member]
Past due loans	0	5,000
Consumer Non Real Estate Portfolio Segment [Member] | Automobile Loan [Member]
Loans past due 90 days or more and still accruing	0	5,000
Nonaccruals (including impaired nonaccruals)	0	0
Consumer Non Real Estate Portfolio Segment [Member] | Other Consumer Loans [Member] | Financing Receivables 30 to 89 Days Past Due [Member]
Past due loans	21,000	60,000
Consumer Non Real Estate Portfolio Segment [Member] | Other Consumer Loans [Member] | Financing Receivables, Equal to Greater than 90 Days Past Due [Member]
Past due loans	2,000	0
Consumer Non Real Estate Portfolio Segment [Member] | Other Consumer Loans [Member]
Loans past due 90 days or more and still accruing	1,000	0
Nonaccruals (including impaired nonaccruals)	0	0
Public Sector and IDA Portfolio Segment[Member]
Past due loans		0
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	2,582,000	2,992,000
Financing Receivables, Equal to Greater than 90 Days Past Due [Member]
Past due loans	3,092,000	3,124,000
Loans past due 90 days or more and still accruing	328,000	156,000	$ 272,000
Nonaccruals (including impaired nonaccruals)	$ 6,405,000	$ 6,682,000	$ 9,225,000