Note 4 - Allowance for Loan Losses, Nonperforming Assets and Impaired Loans - Past Due and Nonaccrual Loans (Details) - USD ($)		Jun. 30, 2016		Dec. 31, 2015	Jun. 30, 2015
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				26,000
Financing Receivables 30 to 89 Days Past Due [Member] | Consumer Real Estate Portfolio Segment [Member] | Equity Lines [Member]
Past due loans		37,000	[1]	16,000
Financing Receivables 30 to 89 Days Past Due [Member] | Consumer Real Estate Portfolio Segment [Member] | Closed End First Liens [Member]
Past due loans		1,229,000	[1]	1,402,000
Financing Receivables 30 to 89 Days Past Due [Member] | Consumer Real Estate Portfolio Segment [Member] | Closed End Junior Liens [Member]
Past due loans		21,000	[1]	123,000
Financing Receivables 30 to 89 Days Past Due [Member] | Consumer Real Estate Portfolio Segment [Member] | Investor Owned Residential Real Estate [Member]
Past due loans		242,000	[1]	248,000
Financing Receivables 30 to 89 Days Past Due [Member] | Commercial Real Estate Portfolio Segment [Member] | Multifamily Real Estate [Member]
Past due loans		330,000	[1]	684,000
Financing Receivables 30 to 89 Days Past Due [Member] | Commercial Real Estate Portfolio Segment [Member] | Commercial Real Estate, Owner Occupied [Member]
Past due loans		0	[1]	0
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 Portfolio Segment [Member] | Commercial and Industrial [Member]
Past due loans		45,000	[1]	142,000
Financing Receivables 30 to 89 Days Past Due [Member] | Consumer Non Real Estate Portfolio Segment [Member] | Credit Card Receivable [Member]
Past due loans		18,000	[1]	5,000
Financing Receivables 30 to 89 Days Past Due [Member] | Consumer Non Real Estate Portfolio Segment [Member] | Automobile Loan [Member]
Past due loans		237,000	[1]	286,000
Financing Receivables 30 to 89 Days Past Due [Member] | Consumer Non Real Estate Portfolio Segment [Member] | Other Consumer Loans [Member]
Past due loans		49,000	[1]	60,000
Financing Receivables 30 to 89 Days Past Due [Member] | Public Sector and IDA Portfolio Segment[Member]
Past due loans				0
Financing Receivables 30 to 89 Days Past Due [Member]
Past due loans		2,208,000	[1]	2,992,000
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		48,000	[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		216,000	[1]	106,000
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		37,000	[1]	39,000
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		12,000	[1]	0
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Commercial Real Estate Portfolio Segment [Member] | Multifamily Real Estate [Member]
Past due loans		1,594,000	[1]	1,728,000
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		610,000	[1]	357,000
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]	0
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Commercial Portfolio Segment [Member] | Commercial and Industrial [Member]
Past due loans		315,000	[1]	883,000
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		4,000	[1]	6,000
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Consumer Non Real Estate Portfolio Segment [Member] | Automobile Loan [Member]
Past due loans		11,000	[1]	5,000
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		0	[1]	0
Financing Receivables, Equal to Greater than 90 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		2,847,000	[1]	3,124,000
Real Estate Construction Portfolio Segment[Member] | Construction Residential [Member]
90 or more days past due and still accruing		0	[1]	0
Nonaccruals (including impaired nonaccruals)		678,000	[1]	718,000
Real Estate Construction Portfolio Segment[Member] | Construction Other [Member]
90 or more days past due and still accruing				0
Nonaccruals (including impaired nonaccruals)				0
Consumer Real Estate Portfolio Segment [Member] | Equity Lines [Member]
90 or more days past due and still accruing		48,000	[1]	0
Nonaccruals (including impaired nonaccruals)		0	[1]	0
Consumer Real Estate Portfolio Segment [Member] | Closed End First Liens [Member]
90 or more days past due and still accruing		216,000	[1]	106,000
Nonaccruals (including impaired nonaccruals)		0	[1]	14,000
Consumer Real Estate Portfolio Segment [Member] | Closed End Junior Liens [Member]
90 or more days past due and still accruing		37,000	[1]	39,000
Nonaccruals (including impaired nonaccruals)		0	[1]	0
Consumer Real Estate Portfolio Segment [Member] | Investor Owned Residential Real Estate [Member]
90 or more days past due and still accruing			[1]	0
Nonaccruals (including impaired nonaccruals)		22,000	[1]	0
Consumer Real Estate Portfolio Segment [Member] | Credit Card Receivable [Member]
Nonaccruals (including impaired nonaccruals)	[1]	0
Commercial Real Estate Portfolio Segment [Member] | Multifamily Real Estate [Member]
90 or more days past due and still accruing		0	[1]
Nonaccruals (including impaired nonaccruals)		1,594,000	[1]	1,728,000
Commercial Real Estate Portfolio Segment [Member] | Commercial Real Estate, Owner Occupied [Member]
90 or more days past due and still accruing		0	[1]
Nonaccruals (including impaired nonaccruals)		737,000	[1]	494,000
Commercial Real Estate Portfolio Segment [Member] | Commercial Real Estate Other [Member]
90 or more days past due and still accruing		0	[1]	0
Nonaccruals (including impaired nonaccruals)		2,774,000	[1]	2,845,000
Commercial Portfolio Segment [Member] | Commercial and Industrial [Member]
90 or more days past due and still accruing		0	[1]	0
Nonaccruals (including impaired nonaccruals)		400,000	[1]	883,000
Consumer Non Real Estate Portfolio Segment [Member] | Credit Card Receivable [Member]
90 or more days past due and still accruing		4,000	[1]	6,000
Nonaccruals (including impaired nonaccruals)				0
Consumer Non Real Estate Portfolio Segment [Member] | Automobile Loan [Member]
90 or more days past due and still accruing		11,000	[1]	5,000
Nonaccruals (including impaired nonaccruals)		0	[1]	0
Consumer Non Real Estate Portfolio Segment [Member] | Other Consumer Loans [Member]
90 or more days past due and still accruing		0	[1]	0
Nonaccruals (including impaired nonaccruals)		0	[1]	0
Public Sector and IDA Portfolio Segment[Member]
90 or more days past due and still accruing				0
Nonaccruals (including impaired nonaccruals)				0
90 or more days past due and still accruing		316,000	[1]	156,000	$ 80,000
Nonaccruals (including impaired nonaccruals)		$ 6,205,000		$ 6,682,000	$ 8,905,000

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