Note 5 - Allowance for Loan Losses, Nonperforming Assets and Impaired Loans (Details) - Loans by Credit Quality Indicator - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Financing Receivable, Recorded Investment [Line Items]
Non-impaired gross loans	$ 604,538	$ 591,198
Pass [Member]
Financing Receivable, Recorded Investment [Line Items]
Non-impaired gross loans	592,323	575,613
Special Mention [Member]
Financing Receivable, Recorded Investment [Line Items]
Non-impaired gross loans	6,144	5,300
Classified Excluding Impaired [Member]
Financing Receivable, Recorded Investment [Line Items]
Non-impaired gross loans	6,071	10,285
Real Estate Construction Portfolio Segment[Member]
Financing Receivable, Recorded Investment [Line Items]
Non-impaired gross loans	47,533	45,562
Real Estate Construction Portfolio Segment[Member] | Construction, 1-4 Family Residential [Member] | Pass [Member]
Financing Receivable, Recorded Investment [Line Items]
Non-impaired gross loans	10,626	14,222
Real Estate Construction Portfolio Segment[Member] | Construction, 1-4 Family Residential [Member] | Special Mention [Member]
Financing Receivable, Recorded Investment [Line Items]
Non-impaired gross loans	3,694	0
Real Estate Construction Portfolio Segment[Member] | Construction, 1-4 Family Residential [Member] | Classified Excluding Impaired [Member]
Financing Receivable, Recorded Investment [Line Items]
Non-impaired gross loans	0	2,265
Real Estate Construction Portfolio Segment[Member] | Construction Other [Member] | Pass [Member]
Financing Receivable, Recorded Investment [Line Items]
Non-impaired gross loans	33,213	29,047
Real Estate Construction Portfolio Segment[Member] | Construction Other [Member] | Special Mention [Member]
Financing Receivable, Recorded Investment [Line Items]
Non-impaired gross loans	0	0
Real Estate Construction Portfolio Segment[Member] | Construction Other [Member] | Classified Excluding Impaired [Member]
Financing Receivable, Recorded Investment [Line Items]
Non-impaired gross loans	0	28
Consumer Real Estate Portfolio Segment [Member]
Financing Receivable, Recorded Investment [Line Items]
Non-impaired gross loans	142,542	146,220
Consumer Real Estate Portfolio Segment [Member] | Equity Lines [Member] | Pass [Member]
Financing Receivable, Recorded Investment [Line Items]
Non-impaired gross loans	16,236	15,861
Consumer Real Estate Portfolio Segment [Member] | Equity Lines [Member] | Special Mention [Member]
Financing Receivable, Recorded Investment [Line Items]
Non-impaired gross loans	15	59
Consumer Real Estate Portfolio Segment [Member] | Equity Lines [Member] | Classified Excluding Impaired [Member]
Financing Receivable, Recorded Investment [Line Items]
Non-impaired gross loans	87	60
Consumer Real Estate Portfolio Segment [Member] | Closed-end First Liens [Member] | Pass [Member]
Financing Receivable, Recorded Investment [Line Items]
Non-impaired gross loans	78,614	78,806
Consumer Real Estate Portfolio Segment [Member] | Closed-end First Liens [Member] | Special Mention [Member]
Financing Receivable, Recorded Investment [Line Items]
Non-impaired gross loans	708	1,566
Consumer Real Estate Portfolio Segment [Member] | Closed-end First Liens [Member] | Classified Excluding Impaired [Member]
Financing Receivable, Recorded Investment [Line Items]
Non-impaired gross loans	1,370	1,412
Consumer Real Estate Portfolio Segment [Member] | Closed-end Junior Liens [Member] | Pass [Member]
Financing Receivable, Recorded Investment [Line Items]
Non-impaired gross loans	4,983	4,258
Consumer Real Estate Portfolio Segment [Member] | Closed-end Junior Liens [Member] | Special Mention [Member]
Financing Receivable, Recorded Investment [Line Items]
Non-impaired gross loans	55	21
Consumer Real Estate Portfolio Segment [Member] | Closed-end Junior Liens [Member] | Classified Excluding Impaired [Member]
Financing Receivable, Recorded Investment [Line Items]
Non-impaired gross loans	61	95
Consumer Real Estate Portfolio Segment [Member] | Investor-owned Residential Real Estate [Member] | Pass [Member]
Financing Receivable, Recorded Investment [Line Items]
Non-impaired gross loans	39,616	42,781
Consumer Real Estate Portfolio Segment [Member] | Investor-owned Residential Real Estate [Member] | Special Mention [Member]
Financing Receivable, Recorded Investment [Line Items]
Non-impaired gross loans	31	688
Consumer Real Estate Portfolio Segment [Member] | Investor-owned Residential Real Estate [Member] | Classified Excluding Impaired [Member]
Financing Receivable, Recorded Investment [Line Items]
Non-impaired gross loans	766	614
Commercial Real Estate Portfolio Segment [Member]
Financing Receivable, Recorded Investment [Line Items]
Non-impaired gross loans	296,803	297,138
Commercial Real Estate Portfolio Segment [Member] | Multifamily Real Estate [Member] | Pass [Member]
Financing Receivable, Recorded Investment [Line Items]
Non-impaired gross loans	77,060	73,611
Commercial Real Estate Portfolio Segment [Member] | Multifamily Real Estate [Member] | Special Mention [Member]
Financing Receivable, Recorded Investment [Line Items]
Non-impaired gross loans	0	1,397
Commercial Real Estate Portfolio Segment [Member] | Multifamily Real Estate [Member] | Classified Excluding Impaired [Member]
Financing Receivable, Recorded Investment [Line Items]
Non-impaired gross loans	1,804	850
Commercial Real Estate Portfolio Segment [Member] | Commercial Real Estate, Owner Occupied [Member] | Pass [Member]
Financing Receivable, Recorded Investment [Line Items]
Non-impaired gross loans	121,741	125,643
Commercial Real Estate Portfolio Segment [Member] | Commercial Real Estate, Owner Occupied [Member] | Special Mention [Member]
Financing Receivable, Recorded Investment [Line Items]
Non-impaired gross loans	1,165	202
Commercial Real Estate Portfolio Segment [Member] | Commercial Real Estate, Owner Occupied [Member] | Classified Excluding Impaired [Member]
Financing Receivable, Recorded Investment [Line Items]
Non-impaired gross loans	1,274	2,855
Commercial Real Estate Portfolio Segment [Member] | Commercial Real Estate, Other [Member] | Pass [Member]
Financing Receivable, Recorded Investment [Line Items]
Non-impaired gross loans	93,701	90,821
Commercial Real Estate Portfolio Segment [Member] | Commercial Real Estate, Other [Member] | Special Mention [Member]
Financing Receivable, Recorded Investment [Line Items]
Non-impaired gross loans	58	1,177
Commercial Real Estate Portfolio Segment [Member] | Commercial Real Estate, Other [Member] | Classified Excluding Impaired [Member]
Financing Receivable, Recorded Investment [Line Items]
Non-impaired gross loans	0	582
Commercial Portfolio Segment [Member] | Commercial and Industrial [Member] | Pass [Member]
Financing Receivable, Recorded Investment [Line Items]
Non-impaired gross loans	35,652	31,247
Commercial Portfolio Segment [Member] | Commercial and Industrial [Member] | Special Mention [Member]
Financing Receivable, Recorded Investment [Line Items]
Non-impaired gross loans	285	97
Commercial Portfolio Segment [Member] | Commercial and Industrial [Member] | Classified Excluding Impaired [Member]
Financing Receivable, Recorded Investment [Line Items]
Non-impaired gross loans	543	1,390
Public Sector and IDA Portfolio Segment[Member]
Financing Receivable, Recorded Investment [Line Items]
Non-impaired gross loans	51,335	41,361
Public Sector and IDA Portfolio Segment[Member] | States & Political Subdivisions [Member] | Pass [Member]
Financing Receivable, Recorded Investment [Line Items]
Non-impaired gross loans	51,335	41,361
Public Sector and IDA Portfolio Segment[Member] | States & Political Subdivisions [Member] | Special Mention [Member]
Financing Receivable, Recorded Investment [Line Items]
Non-impaired gross loans	0	0
Public Sector and IDA Portfolio Segment[Member] | States & Political Subdivisions [Member] | Classified Excluding Impaired [Member]
Financing Receivable, Recorded Investment [Line Items]
Non-impaired gross loans	0	0
Consumer Portfolio Segment [Member]
Financing Receivable, Recorded Investment [Line Items]
Non-impaired gross loans	29,845	28,182
Consumer Portfolio Segment [Member] | Credit Card Receivable [Member] | Pass [Member]
Financing Receivable, Recorded Investment [Line Items]
Non-impaired gross loans	5,773	5,705
Consumer Portfolio Segment [Member] | Credit Card Receivable [Member] | Special Mention [Member]
Financing Receivable, Recorded Investment [Line Items]
Non-impaired gross loans	0	0
Consumer Portfolio Segment [Member] | Credit Card Receivable [Member] | Classified Excluding Impaired [Member]
Financing Receivable, Recorded Investment [Line Items]
Non-impaired gross loans	0	0
Consumer Portfolio Segment [Member] | Automobile Loan [Member] | Pass [Member]
Financing Receivable, Recorded Investment [Line Items]
Non-impaired gross loans	12,414	11,505
Consumer Portfolio Segment [Member] | Automobile Loan [Member] | Special Mention [Member]
Financing Receivable, Recorded Investment [Line Items]
Non-impaired gross loans	102	93
Consumer Portfolio Segment [Member] | Automobile Loan [Member] | Classified Excluding Impaired [Member]
Financing Receivable, Recorded Investment [Line Items]
Non-impaired gross loans	138	128
Consumer Portfolio Segment [Member] | Other Consumer Loans [Member] | Pass [Member]
Financing Receivable, Recorded Investment [Line Items]
Non-impaired gross loans	11,359	10,745
Consumer Portfolio Segment [Member] | Other Consumer Loans [Member] | Special Mention [Member]
Financing Receivable, Recorded Investment [Line Items]
Non-impaired gross loans	31	0
Consumer Portfolio Segment [Member] | Other Consumer Loans [Member] | Classified Excluding Impaired [Member]
Financing Receivable, Recorded Investment [Line Items]
Non-impaired gross loans	$ 28	$ 6