Note 3 - Allowance for Loan Losses, Nonperforming Assets and Impaired Loans - Past Due and Nonaccrual Loans (Details) - USD ($) $ in Thousands		Jun. 30, 2017		Dec. 31, 2016		Jun. 30, 2016
Nonaccruals (including impaired nonaccruals)		$ 3,197	[1],[2]	$ 5,855	[1],[2]	$ 6,205
Loans past due 90 days or more and still accruing		259	[2]	63	[2]	$ 316
Consumer Real Estate Portfolio Segment [Member] | Equity Lines [Member]
Nonaccruals (including impaired nonaccruals)	[1],[2]	0		0
Loans past due 90 days or more and still accruing	[2]	0		0
Consumer Real Estate Portfolio Segment [Member] | Closed End First Liens [Member]
Nonaccruals (including impaired nonaccruals)	[1],[2]	0		0
Loans past due 90 days or more and still accruing	[2]			6
Consumer Real Estate Portfolio Segment [Member] | Closed End Junior Liens [Member]
Nonaccruals (including impaired nonaccruals)	[1],[2]	0		0
Loans past due 90 days or more and still accruing	[2]			36
Consumer Real Estate Portfolio Segment [Member] | Investor Owned Residential Real Estate [Member]
Nonaccruals (including impaired nonaccruals)	[1],[2]	271		253
Loans past due 90 days or more and still accruing	[2]	0		0
Real Estate Construction Portfolio Segment[Member] | Construction Residential [Member]
Nonaccruals (including impaired nonaccruals)	[1],[2]			270
Loans past due 90 days or more and still accruing	[2]			0
Real Estate Construction Portfolio Segment[Member] | Construction, Other [Member]
Nonaccruals (including impaired nonaccruals)	[1],[2]			0
Loans past due 90 days or more and still accruing	[2]			0
Commercial Real Estate Portfolio Segment [Member] | Multifamily Real Estate [Member]
Nonaccruals (including impaired nonaccruals)	[1],[2]	0		1,091
Loans past due 90 days or more and still accruing	[2]	0		0
Commercial Real Estate Portfolio Segment [Member] | Commercial Real Estate, Owner Occupied [Member]
Nonaccruals (including impaired nonaccruals)	[1],[2]	133		1,183
Loans past due 90 days or more and still accruing	[2]	0		0
Commercial Real Estate Portfolio Segment [Member] | Commercial Real Estate Other [Member]
Nonaccruals (including impaired nonaccruals)	[1],[2]	2,655		2,814
Loans past due 90 days or more and still accruing	[2]	0		0
Commercial Non Real Estate Segment [Member] | Commercial and Industrial [Member]
Nonaccruals (including impaired nonaccruals)	[1],[2]	136
Loans past due 90 days or more and still accruing	[2]	200
Consumer Non Real Estate Portfolio Segment [Member] | Credit Card Receivable [Member]
Nonaccruals (including impaired nonaccruals)	[1],[2]	0		0
Loans past due 90 days or more and still accruing	[2]	5		5
Consumer Non Real Estate Portfolio Segment [Member] | Automobile Loan [Member]
Nonaccruals (including impaired nonaccruals)	[1],[2]	2		3
Loans past due 90 days or more and still accruing	[2]	33		12
Consumer Non Real Estate Portfolio Segment [Member] | Other Consumer Loans [Member]
Nonaccruals (including impaired nonaccruals)	[1],[2]	0		0
Loans past due 90 days or more and still accruing	[2]	21		4
Commercial Portfolio Segment [Member] | Commercial and Industrial [Member]
Nonaccruals (including impaired nonaccruals)	[1],[2]			241
Loans past due 90 days or more and still accruing	[2]			0
Financing Receivables 30 to 89 Days Past Due [Member]
Past due loans	[2]	1,988		2,553
Financing Receivables 30 to 89 Days Past Due [Member] | Consumer Real Estate Portfolio Segment [Member] | Equity Lines [Member]
Past due loans	[2]	91		10
Financing Receivables 30 to 89 Days Past Due [Member] | Consumer Real Estate Portfolio Segment [Member] | Closed End First Liens [Member]
Past due loans	[2]	901		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	[2]	185		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	[2]	165		56
Financing Receivables 30 to 89 Days Past Due [Member] | Real Estate Construction Portfolio Segment[Member] | Construction Residential [Member]
Past due loans	[2]			0
Financing Receivables 30 to 89 Days Past Due [Member] | Real Estate Construction Portfolio Segment[Member] | Construction, Other [Member]
Past due loans	[2]			25
Financing Receivables 30 to 89 Days Past Due [Member] | Commercial Real Estate Portfolio Segment [Member] | Multifamily Real Estate [Member]
Past due loans	[2]	57		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	[2]	122		339
Financing Receivables 30 to 89 Days Past Due [Member] | Commercial Real Estate Portfolio Segment [Member] | Commercial Real Estate Other [Member]
Past due loans	[2]	0		0
Financing Receivables 30 to 89 Days Past Due [Member] | Commercial Non Real Estate Segment [Member] | Commercial and Industrial [Member]
Past due loans	[2]	258
Financing Receivables 30 to 89 Days Past Due [Member] | Consumer Non Real Estate Portfolio Segment [Member] | Credit Card Receivable [Member]
Past due loans	[2]	2		8
Financing Receivables 30 to 89 Days Past Due [Member] | Consumer Non Real Estate Portfolio Segment [Member] | Automobile Loan [Member]
Past due loans	[2]	132		234
Financing Receivables 30 to 89 Days Past Due [Member] | Consumer Non Real Estate Portfolio Segment [Member] | Other Consumer Loans [Member]
Past due loans	[2]	75		131
Financing Receivables 30 to 89 Days Past Due [Member] | Commercial Portfolio Segment [Member] | Commercial and Industrial [Member]
Past due loans	[2]			6
Financing Receivables, Equal to Greater than 90 Days Past Due [Member]
Past due loans	[2]	518		1,888
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Consumer Real Estate Portfolio Segment [Member] | Equity Lines [Member]
Past due loans	[2]	0		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	[2]			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	[2]			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	[2]	8		234
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Real Estate Construction Portfolio Segment[Member] | Construction Residential [Member]
Past due loans	[2]			0
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Real Estate Construction Portfolio Segment[Member] | Construction, Other [Member]
Past due loans	[2]			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	[2]			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	[2]	133		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	[2]	0		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	[2]	318
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	[2]	5		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	[2]	33		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	[2]	$ 21		4
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Commercial Portfolio Segment [Member] | Commercial and Industrial [Member]
Past due loans	[2]			$ 218

[1] Includes current and past due loans in nonaccrual status. Includes impaired loans in nonaccrual status.

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