Note 7 - Loans (Details) - Outstanding Loans by Risk Rating - USD ($) $ in Thousands	Jun. 30, 2015	Dec. 31, 2014
Financing Receivable, Recorded Investment [Line Items]
Loans receivable	$ 663,818	$ 630,545
Pass [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans receivable	627,234	591,547
Special Mention [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans receivable	14,396	12,788
Substandard [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans receivable	21,974	25,989
Doubtful [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans receivable	214	221
Residential Portfolio Segment [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans receivable	375,271	366,416
Residential Portfolio Segment [Member] | Pass [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans receivable	364,059	353,250
Residential Portfolio Segment [Member] | Special Mention [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans receivable	2,001	1,672
Residential Portfolio Segment [Member] | Substandard [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans receivable	9,138	11,416
Residential Portfolio Segment [Member] | Doubtful [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans receivable	73	78
Residential Portfolio Segment [Member] | Home Equity Line of Credit1 [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans receivable	39,140	36,629
Residential Portfolio Segment [Member] | Home Equity Line of Credit1 [Member] | Pass [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans receivable	37,328	35,935
Residential Portfolio Segment [Member] | Home Equity Line of Credit1 [Member] | Special Mention [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans receivable	1,407	294
Residential Portfolio Segment [Member] | Home Equity Line of Credit1 [Member] | Substandard [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans receivable	405	400
Residential Portfolio Segment [Member] | Home Equity Line of Credit1 [Member] | Doubtful [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans receivable	0	0
Residential Portfolio Segment [Member] | Construction Loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans receivable	19,651	16,739
Residential Portfolio Segment [Member] | Construction Loans [Member] | Pass [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans receivable	19,632	16,719
Residential Portfolio Segment [Member] | Construction Loans [Member] | Special Mention [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans receivable	19	20
Residential Portfolio Segment [Member] | Construction Loans [Member] | Substandard [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans receivable	0	0
Residential Portfolio Segment [Member] | Construction Loans [Member] | Doubtful [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans receivable	0	0
Residential Portfolio Segment [Member] | Senior Lien [Member] | Real Estate Loan [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans receivable	294,978	291,882
Residential Portfolio Segment [Member] | Senior Lien [Member] | Real Estate Loan [Member] | Pass [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans receivable	286,168	280,094
Residential Portfolio Segment [Member] | Senior Lien [Member] | Real Estate Loan [Member] | Special Mention [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans receivable	485	1,246
Residential Portfolio Segment [Member] | Senior Lien [Member] | Real Estate Loan [Member] | Substandard [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans receivable	8,252	10,464
Residential Portfolio Segment [Member] | Senior Lien [Member] | Real Estate Loan [Member] | Doubtful [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans receivable	73	78
Residential Portfolio Segment [Member] | Junior Lien [Member] | Real Estate Loan [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans receivable	21,502	21,166
Residential Portfolio Segment [Member] | Junior Lien [Member] | Real Estate Loan [Member] | Pass [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans receivable	20,931	20,502
Residential Portfolio Segment [Member] | Junior Lien [Member] | Real Estate Loan [Member] | Special Mention [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans receivable	90	112
Residential Portfolio Segment [Member] | Junior Lien [Member] | Real Estate Loan [Member] | Substandard [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans receivable	481	552
Residential Portfolio Segment [Member] | Junior Lien [Member] | Real Estate Loan [Member] | Doubtful [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans receivable	0	0
Commercial Portfolio Segment [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans receivable	278,446	253,895
Commercial Portfolio Segment [Member] | Pass [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans receivable	253,260	228,202
Commercial Portfolio Segment [Member] | Special Mention [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans receivable	12,373	11,094
Commercial Portfolio Segment [Member] | Substandard [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans receivable	12,672	14,456
Commercial Portfolio Segment [Member] | Doubtful [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans receivable	141	143
Commercial Portfolio Segment [Member] | Real Estate Loan [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans receivable	135,063	145,878
Commercial Portfolio Segment [Member] | Real Estate Loan [Member] | Pass [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans receivable	121,059	133,204
Commercial Portfolio Segment [Member] | Real Estate Loan [Member] | Special Mention [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans receivable	5,139	2,775
Commercial Portfolio Segment [Member] | Real Estate Loan [Member] | Substandard [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans receivable	8,865	9,899
Commercial Portfolio Segment [Member] | Real Estate Loan [Member] | Doubtful [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans receivable	0	0
Commercial Portfolio Segment [Member] | Construction Loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans receivable	7,826	6,938
Commercial Portfolio Segment [Member] | Construction Loans [Member] | Pass [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans receivable	5,744	4,650
Commercial Portfolio Segment [Member] | Construction Loans [Member] | Special Mention [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans receivable	164	266
Commercial Portfolio Segment [Member] | Construction Loans [Member] | Substandard [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans receivable	1,918	2,022
Commercial Portfolio Segment [Member] | Construction Loans [Member] | Doubtful [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans receivable	0	0
Commercial Portfolio Segment [Member] | Commercial and Industrial [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans receivable	61,427	50,157
Commercial Portfolio Segment [Member] | Commercial and Industrial [Member] | Pass [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans receivable	54,601	41,751
Commercial Portfolio Segment [Member] | Commercial and Industrial [Member] | Special Mention [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans receivable	6,291	7,246
Commercial Portfolio Segment [Member] | Commercial and Industrial [Member] | Substandard [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans receivable	417	1,042
Commercial Portfolio Segment [Member] | Commercial and Industrial [Member] | Doubtful [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans receivable	118	118
Commercial Portfolio Segment [Member] | Political Subdivisions [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans receivable	40,908	17,534
Commercial Portfolio Segment [Member] | Political Subdivisions [Member] | Pass [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans receivable	40,908	17,534
Commercial Portfolio Segment [Member] | Political Subdivisions [Member] | Special Mention [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans receivable	0	0
Commercial Portfolio Segment [Member] | Political Subdivisions [Member] | Substandard [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans receivable	0	0
Commercial Portfolio Segment [Member] | Political Subdivisions [Member] | Doubtful [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans receivable	0	0
Commercial Portfolio Segment [Member] | Loans Secured by Farmland [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans receivable	7,565	7,916
Commercial Portfolio Segment [Member] | Loans Secured by Farmland [Member] | Pass [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans receivable	5,668	5,990
Commercial Portfolio Segment [Member] | Loans Secured by Farmland [Member] | Special Mention [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans receivable	423	433
Commercial Portfolio Segment [Member] | Loans Secured by Farmland [Member] | Substandard [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans receivable	1,451	1,468
Commercial Portfolio Segment [Member] | Loans Secured by Farmland [Member] | Doubtful [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans receivable	23	25
Commercial Portfolio Segment [Member] | Multi-family (5 or more) Residential [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans receivable	8,561	8,917
Commercial Portfolio Segment [Member] | Multi-family (5 or more) Residential [Member] | Pass [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans receivable	8,287	8,629
Commercial Portfolio Segment [Member] | Multi-family (5 or more) Residential [Member] | Special Mention [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans receivable	274	288
Commercial Portfolio Segment [Member] | Multi-family (5 or more) Residential [Member] | Substandard [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans receivable	0	0
Commercial Portfolio Segment [Member] | Multi-family (5 or more) Residential [Member] | Doubtful [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans receivable	0	0
Commercial Portfolio Segment [Member] | Agricultural Loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans receivable	4,287	3,221
Commercial Portfolio Segment [Member] | Agricultural Loans [Member] | Pass [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans receivable	4,266	3,196
Commercial Portfolio Segment [Member] | Agricultural Loans [Member] | Special Mention [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans receivable	0	0
Commercial Portfolio Segment [Member] | Agricultural Loans [Member] | Substandard [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans receivable	21	25
Commercial Portfolio Segment [Member] | Agricultural Loans [Member] | Doubtful [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans receivable	0	0
Commercial Portfolio Segment [Member] | Other Commercial Loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans receivable	12,809	13,334
Commercial Portfolio Segment [Member] | Other Commercial Loans [Member] | Pass [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans receivable	12,727	13,248
Commercial Portfolio Segment [Member] | Other Commercial Loans [Member] | Special Mention [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans receivable	82	86
Commercial Portfolio Segment [Member] | Other Commercial Loans [Member] | Substandard [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans receivable	0	0
Commercial Portfolio Segment [Member] | Other Commercial Loans [Member] | Doubtful [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans receivable	0	0
Consumer Portfolio Segment [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans receivable	10,101	10,234
Consumer Portfolio Segment [Member] | Pass [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans receivable	9,915	10,095
Consumer Portfolio Segment [Member] | Special Mention [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans receivable	22	22
Consumer Portfolio Segment [Member] | Substandard [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans receivable	164	117
Consumer Portfolio Segment [Member] | Doubtful [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans receivable	$ 0	$ 0