Note 3 - Loans (Details) - Loan Portfolio by Credit Quality Indicator - USD ($) $ in Thousands	Jun. 30, 2015	Dec. 31, 2014	Jun. 30, 2014
Commercial and Agricultural
Loans receivable	$ 760,078	$ 746,094	$ 735,763
Pass [Member]
Commercial and Agricultural
Loans receivable	706,532	686,072
Special Mention [Member]
Commercial and Agricultural
Loans receivable	25,927	27,139
Substandard [Member]
Commercial and Agricultural
Loans receivable	27,619	32,883
Commercial and Agricultural Portfolio Segment [Member] | Commercial [Member]
Commercial and Agricultural
Loans receivable	52,506	50,960	41,840
Commercial and Agricultural Portfolio Segment [Member] | Commercial [Member] | Pass [Member]
Commercial and Agricultural
Loans receivable	49,301	46,230
Commercial and Agricultural Portfolio Segment [Member] | Commercial [Member] | Special Mention [Member]
Commercial and Agricultural
Loans receivable	1,400	2,905
Commercial and Agricultural Portfolio Segment [Member] | Commercial [Member] | Substandard [Member]
Commercial and Agricultural
Loans receivable	1,805	1,825
Commercial and Agricultural Portfolio Segment [Member] | Agricultural [Member]
Commercial and Agricultural
Loans receivable	24,019	16,689	18,568
Commercial and Agricultural Portfolio Segment [Member] | Agricultural [Member] | Pass [Member]
Commercial and Agricultural
Loans receivable	23,831	16,504
Commercial and Agricultural Portfolio Segment [Member] | Agricultural [Member] | Special Mention [Member]
Commercial and Agricultural
Loans receivable	27	27
Commercial and Agricultural Portfolio Segment [Member] | Agricultural [Member] | Substandard [Member]
Commercial and Agricultural
Loans receivable	161	158
Real Estate Portfolio Segment [Member] | Commercial [Member]
Commercial and Agricultural
Loans receivable	341,167	332,231	332,895
Real Estate Portfolio Segment [Member] | Commercial [Member] | Pass [Member]
Commercial and Agricultural
Loans receivable	321,278	309,828
Real Estate Portfolio Segment [Member] | Commercial [Member] | Special Mention [Member]
Commercial and Agricultural
Loans receivable	9,713	11,220
Real Estate Portfolio Segment [Member] | Commercial [Member] | Substandard [Member]
Commercial and Agricultural
Loans receivable	10,176	11,183
Real Estate Portfolio Segment [Member] | Commercial Constuction [Member]
Commercial and Agricultural
Loans receivable	46,699	51,259	50,180
Real Estate Portfolio Segment [Member] | Commercial Constuction [Member] | Pass [Member]
Commercial and Agricultural
Loans receivable	40,923	45,063
Real Estate Portfolio Segment [Member] | Commercial Constuction [Member] | Special Mention [Member]
Commercial and Agricultural
Loans receivable	1,476	1,741
Real Estate Portfolio Segment [Member] | Commercial Constuction [Member] | Substandard [Member]
Commercial and Agricultural
Loans receivable	4,300	4,455
Real Estate Portfolio Segment [Member] | Residential Construction [Member]
Commercial and Agricultural
Loans receivable	11,327	11,221	10,875
Real Estate Portfolio Segment [Member] | Residential Construction [Member] | Pass [Member]
Commercial and Agricultural
Loans receivable	11,327	11,221
Real Estate Portfolio Segment [Member] | Residential Construction [Member] | Special Mention [Member]
Commercial and Agricultural
Loans receivable	0	0
Real Estate Portfolio Segment [Member] | Residential Construction [Member] | Substandard [Member]
Commercial and Agricultural
Loans receivable	0	0
Real Estate Portfolio Segment [Member] | Residential [Member]
Commercial and Agricultural
Loans receivable	202,805	203,753	201,513
Real Estate Portfolio Segment [Member] | Residential [Member] | Pass [Member]
Commercial and Agricultural
Loans receivable	180,884	180,550
Real Estate Portfolio Segment [Member] | Residential [Member] | Special Mention [Member]
Commercial and Agricultural
Loans receivable	12,726	10,582
Real Estate Portfolio Segment [Member] | Residential [Member] | Substandard [Member]
Commercial and Agricultural
Loans receivable	9,195	12,621
Real Estate Portfolio Segment [Member] | Farmland [Member]
Commercial and Agricultural
Loans receivable	54,135	49,951	49,175
Real Estate Portfolio Segment [Member] | Farmland [Member] | Pass [Member]
Commercial and Agricultural
Loans receivable	52,192	47,548
Real Estate Portfolio Segment [Member] | Farmland [Member] | Special Mention [Member]
Commercial and Agricultural
Loans receivable	380	415
Real Estate Portfolio Segment [Member] | Farmland [Member] | Substandard [Member]
Commercial and Agricultural
Loans receivable	1,563	1,988
Consumer and Other Portfolio Segment [Member] | Consumer [Member]
Commercial and Agricultural
Loans receivable	21,371	22,820	23,548
Consumer and Other Portfolio Segment [Member] | Consumer [Member] | Pass [Member]
Commercial and Agricultural
Loans receivable	20,749	22,115
Consumer and Other Portfolio Segment [Member] | Consumer [Member] | Special Mention [Member]
Commercial and Agricultural
Loans receivable	204	249
Consumer and Other Portfolio Segment [Member] | Consumer [Member] | Substandard [Member]
Commercial and Agricultural
Loans receivable	418	456
Consumer and Other Portfolio Segment [Member] | Other [Member]
Commercial and Agricultural
Loans receivable	6,049	7,210	$ 7,169
Consumer and Other Portfolio Segment [Member] | Other [Member] | Pass [Member]
Commercial and Agricultural
Loans receivable	6,047	7,013
Consumer and Other Portfolio Segment [Member] | Other [Member] | Special Mention [Member]
Commercial and Agricultural
Loans receivable	1	0
Consumer and Other Portfolio Segment [Member] | Other [Member] | Substandard [Member]
Commercial and Agricultural
Loans receivable	$ 1	$ 197