Note 7 - Loans and Allowance for Loan Losses (Details) - Aging Analysis of Loans - USD ($) $ in Thousands	Jun. 30, 2015	Dec. 31, 2014
Real Estate:
Loans, past due	$ 7,668	$ 6,956
Loans, current	925,637	924,987
Loans, total	933,305	931,943
Financing Receivables, 30 to 89 Days Past Due [Member]
Real Estate:
Loans, past due	2,925	1,584
Financing Receivables, Equal to Greater than 90 Days Past Due [Member]
Real Estate:
Loans, past due	4,743	5,372
Real Estate Portfolio Segment [Member]
Real Estate:
Loans, total	828,337	833,344
Real Estate Portfolio Segment [Member] | Real Estate Construction and Land Development [Member]
Real Estate:
Loans, past due	350	272
Loans, current	105,561	96,773
Loans, total	105,911	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	78	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	272	272
Real Estate Portfolio Segment [Member] | Real Estate Mortgage Residential [Member]
Real Estate:
Loans, past due	3,293	2,990
Loans, current	349,839	358,032
Loans, total	353,132	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	1,678	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	1,615	1,595
Real Estate Portfolio Segment [Member] | Real Estate Mortgage Farmland and Other Commercial Enterprises [Member]
Real Estate:
Loans, past due	3,700	3,559
Loans, current	365,594	371,718
Loans, total	369,294	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	857	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	2,843	3,484
Commercial Portfolio Segment [Member]
Real Estate:
Loans, total	92,733	85,186
Commercial Portfolio Segment [Member] | Commercial and Industrial [Member]
Real Estate:
Loans, past due	13	13
Loans, current	52,300	47,099
Loans, total	52,313	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	13	13
Commercial Portfolio Segment [Member] | States and Political Subdivisions [Member]
Real Estate:
Loans, past due	0	0
Loans, current	21,037	22,369
Loans, total	21,037	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	50	0
Loans, current	0	158
Loans, total	50	158
Commercial Portfolio Segment [Member] | Lease Financing [Member] | Financing Receivables, 30 to 89 Days Past Due [Member]
Real Estate:
Loans, past due	50	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	5	47
Loans, current	19,328	15,500
Loans, total	19,333	15,547
Commercial Portfolio Segment [Member] | Commercial Other [Member] | Financing Receivables, 30 to 89 Days Past Due [Member]
Real Estate:
Loans, past due	5	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	12,235	13,413
Consumer Portfolio Segment [Member] | Consumer Secured [Member]
Real Estate:
Loans, past due	34	58
Loans, current	7,118	7,905
Loans, total	7,152	7,963
Consumer Portfolio Segment [Member] | Consumer Secured [Member] | Financing Receivables, 30 to 89 Days Past Due [Member]
Real Estate:
Loans, past due	34	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	223	17
Loans, current	4,860	5,433
Loans, total	5,083	5,450
Consumer Portfolio Segment [Member] | Consumer Unsecured [Member] | Financing Receivables, 30 to 89 Days Past Due [Member]
Real Estate:
Loans, past due	223	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