Note 7 - Loans and Allowance for Loan Losses (Details) - Aging Analysis of Loans - USD ($) $ in Thousands	Sep. 30, 2015	Dec. 31, 2014
Real Estate:
Loans, past due	$ 5,724	$ 6,956
Loans, current	929,421	924,987
Loans, total	935,145	931,943
Financing Receivables, 30 to 89 Days Past Due [Member]
Real Estate:
Loans, past due	2,655	1,584
Financing Receivables, Equal to Greater than 90 Days Past Due [Member]
Real Estate:
Loans, past due	3,069	5,372
Real Estate Portfolio Segment [Member]
Real Estate:
Loans, total	831,258	833,344
Real Estate Portfolio Segment [Member] | Real Estate Construction and Land Development [Member]
Real Estate:
Loans, past due	229	272
Loans, current	106,901	96,773
Loans, total	107,130	97,045
Real Estate Portfolio Segment [Member] | Real Estate Construction and Land Development [Member] | Financing Receivables, 30 to 89 Days Past Due [Member]
Real Estate:
Loans, past due	2	0
Real Estate Portfolio Segment [Member] | Real Estate Construction and Land Development [Member] | Financing Receivables, Equal to Greater than 90 Days Past Due [Member]
Real Estate:
Loans, past due	227	272
Real Estate Portfolio Segment [Member] | Real Estate Mortgage Residential [Member]
Real Estate:
Loans, past due	2,404	2,990
Loans, current	352,854	358,032
Loans, total	355,258	361,022
Real Estate Portfolio Segment [Member] | Real Estate Mortgage Residential [Member] | Financing Receivables, 30 to 89 Days Past Due [Member]
Real Estate:
Loans, past due	1,706	1,395
Real Estate Portfolio Segment [Member] | Real Estate Mortgage Residential [Member] | Financing Receivables, Equal to Greater than 90 Days Past Due [Member]
Real Estate:
Loans, past due	698	1,595
Real Estate Portfolio Segment [Member] | Real Estate Mortgage Farmland and Other Commercial Enterprises [Member]
Real Estate:
Loans, past due	3,001	3,559
Loans, current	365,869	371,718
Loans, total	368,870	375,277
Real Estate Portfolio Segment [Member] | Real Estate Mortgage Farmland and Other Commercial Enterprises [Member] | Financing Receivables, 30 to 89 Days Past Due [Member]
Real Estate:
Loans, past due	876	75
Real Estate Portfolio Segment [Member] | Real Estate Mortgage Farmland and Other Commercial Enterprises [Member] | Financing Receivables, Equal to Greater than 90 Days Past Due [Member]
Real Estate:
Loans, past due	2,125	3,484
Commercial Portfolio Segment [Member]
Real Estate:
Loans, total	91,858	85,186
Commercial Portfolio Segment [Member] | Commercial and Industrial [Member]
Real Estate:
Loans, past due	19	13
Loans, current	51,168	47,099
Loans, total	51,187	47,112
Commercial Portfolio Segment [Member] | Commercial and Industrial [Member] | Financing Receivables, 30 to 89 Days Past Due [Member]
Real Estate:
Loans, past due	0	0
Commercial Portfolio Segment [Member] | Commercial and Industrial [Member] | Financing Receivables, Equal to Greater than 90 Days Past Due [Member]
Real Estate:
Loans, past due	19	13
Commercial Portfolio Segment [Member] | States and Political Subdivisions [Member]
Real Estate:
Loans, past due	0	0
Loans, current	18,428	22,369
Loans, total	18,428	22,369
Commercial Portfolio Segment [Member] | States and Political Subdivisions [Member] | Financing Receivables, 30 to 89 Days Past Due [Member]
Real Estate:
Loans, past due	0	0
Commercial Portfolio Segment [Member] | States and Political Subdivisions [Member] | Financing Receivables, Equal to Greater than 90 Days Past Due [Member]
Real Estate:
Loans, past due	0	0
Commercial Portfolio Segment [Member] | Lease Financing [Member]
Real Estate:
Loans, past due	25	0
Loans, current	0	158
Loans, total	25	158
Commercial Portfolio Segment [Member] | Lease Financing [Member] | Financing Receivables, 30 to 89 Days Past Due [Member]
Real Estate:
Loans, past due	25	0
Commercial Portfolio Segment [Member] | Lease Financing [Member] | Financing Receivables, Equal to Greater than 90 Days Past Due [Member]
Real Estate:
Loans, past due	0	0
Commercial Portfolio Segment [Member] | Commercial Other [Member]
Real Estate:
Loans, past due	19	47
Loans, current	22,199	15,500
Loans, total	22,218	15,547
Commercial Portfolio Segment [Member] | Commercial Other [Member] | Financing Receivables, 30 to 89 Days Past Due [Member]
Real Estate:
Loans, past due	19	40
Commercial Portfolio Segment [Member] | Commercial Other [Member] | Financing Receivables, Equal to Greater than 90 Days Past Due [Member]
Real Estate:
Loans, past due	0	7
Consumer Portfolio Segment [Member]
Real Estate:
Loans, total	12,029	13,413
Consumer Portfolio Segment [Member] | Consumer Secured [Member]
Real Estate:
Loans, past due	4	58
Loans, current	6,783	7,905
Loans, total	6,787	7,963
Consumer Portfolio Segment [Member] | Consumer Secured [Member] | Financing Receivables, 30 to 89 Days Past Due [Member]
Real Estate:
Loans, past due	4	58
Consumer Portfolio Segment [Member] | Consumer Secured [Member] | Financing Receivables, Equal to Greater than 90 Days Past Due [Member]
Real Estate:
Loans, past due	0	0
Consumer Portfolio Segment [Member] | Consumer Unsecured [Member]
Real Estate:
Loans, past due	23	17
Loans, current	5,219	5,433
Loans, total	5,242	5,450
Consumer Portfolio Segment [Member] | Consumer Unsecured [Member] | Financing Receivables, 30 to 89 Days Past Due [Member]
Real Estate:
Loans, past due	23	16
Consumer Portfolio Segment [Member] | Consumer Unsecured [Member] | Financing Receivables, Equal to Greater than 90 Days Past Due [Member]
Real Estate:
Loans, past due	$ 0	$ 1