Note 4 - Loans and Allowance for Loan Losses - Aging Analysis of Loans (Details) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Loans, past due	$ 5,911	$ 4,666
Loans, current	965,064	954,609
Loans, net of unearned income	970,975	959,275
Loans Past Due 90 Days or More and Still Accruing	0	0
Nonaccrual	6,423	8,380
Financing Receivables 30 to 89 Days Past Due [Member]
Loans, past due	2,395	571
Financing Receivables, Equal to Greater than 90 Days Past Due [Member]
Loans, past due	3,516	4,095
Real Estate Portfolio Segment [Member]
Loans, net of unearned income	870,892	857,036
Real Estate Portfolio Segment [Member] \| Real Estate Construction and Land Development [Member]
Loans, past due	620	227
Loans, current	119,610	115,289
Loans, net of unearned income	120,230	115,516
Loans Past Due 90 Days or More and Still Accruing	0	0
Nonaccrual	712	1,567
Real Estate Portfolio Segment [Member] \| Real Estate Construction and Land Development [Member] \| Financing Receivables 30 to 89 Days Past Due [Member]
Loans, past due	393	0
Real Estate Portfolio Segment [Member] \| Real Estate Construction and Land Development [Member] \| Financing Receivables, Equal to Greater than 90 Days Past Due [Member]
Loans, past due	227	227
Real Estate Portfolio Segment [Member] \| Real Estate Mortgage Residential [Member]
Loans, past due	2,733	1,869
Loans, current	347,562	353,265
Loans, net of unearned income	350,295	355,134
Loans Past Due 90 Days or More and Still Accruing	0	0
Nonaccrual	2,316	2,485
Real Estate Portfolio Segment [Member] \| Real Estate Mortgage Residential [Member] \| Financing Receivables 30 to 89 Days Past Due [Member]
Loans, past due	1,935	421
Real Estate Portfolio Segment [Member] \| Real Estate Mortgage Residential [Member] \| Financing Receivables, Equal to Greater than 90 Days Past Due [Member]
Loans, past due	798	1,448
Real Estate Portfolio Segment [Member] \| Real Estate Mortgage Farmland and Other Commercial Enterprises [Member]
Loans, past due	2,483	2,418
Loans, current	397,884	383,968
Loans, net of unearned income	400,367	386,386
Loans Past Due 90 Days or More and Still Accruing	0	0
Nonaccrual	3,383	4,266
Real Estate Portfolio Segment [Member] \| Real Estate Mortgage Farmland and Other Commercial Enterprises [Member] \| Financing Receivables 30 to 89 Days Past Due [Member]
Loans, past due		42
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]
Loans, past due	2,483	2,376
Commercial Portfolio Segment [Member]
Loans, net of unearned income	90,848	89,820
Commercial Portfolio Segment [Member] \| Commercial and Industrial [Member]
Loans, past due		85
Loans, current	48,607	48,294
Loans, net of unearned income	48,607	48,379
Loans Past Due 90 Days or More and Still Accruing	0	0
Nonaccrual		44
Commercial Portfolio Segment [Member] \| Commercial and Industrial [Member] \| Financing Receivables 30 to 89 Days Past Due [Member]
Loans, past due		42
Commercial Portfolio Segment [Member] \| Commercial and Industrial [Member] \| Financing Receivables, Equal to Greater than 90 Days Past Due [Member]
Loans, past due		43
Commercial Portfolio Segment [Member] \| States and Political Subdivisions [Member]
Loans, past due	0	0
Loans, current	18,933	17,643
Loans, net of unearned income	18,933	17,643
Loans Past Due 90 Days or More and Still Accruing	0	0
Nonaccrual	0	0
Commercial Portfolio Segment [Member] \| States and Political Subdivisions [Member] \| Financing Receivables 30 to 89 Days Past Due [Member]
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]
Loans, past due	0	0
Commercial Portfolio Segment [Member] \| Commercial Other [Member]
Loans, past due	24	39
Loans, current	23,284	23,759
Loans, net of unearned income	23,308	23,798
Loans Past Due 90 Days or More and Still Accruing	0	0
Nonaccrual		8
Commercial Portfolio Segment [Member] \| Commercial Other [Member] \| Financing Receivables 30 to 89 Days Past Due [Member]
Loans, past due	24	39
Commercial Portfolio Segment [Member] \| Commercial Other [Member] \| Financing Receivables, Equal to Greater than 90 Days Past Due [Member]
Loans, past due	0
Consumer Portfolio Segment [Member]
Loans, net of unearned income	9,235	12,419
Consumer Portfolio Segment [Member] \| Consumer Secured [Member]
Loans, past due	13	10
Loans, current	4,541	6,655
Loans, net of unearned income	4,554	6,665
Loans Past Due 90 Days or More and Still Accruing	0	0
Nonaccrual	4	10
Consumer Portfolio Segment [Member] \| Consumer Secured [Member] \| Financing Receivables 30 to 89 Days Past Due [Member]
Loans, past due	13	9
Consumer Portfolio Segment [Member] \| Consumer Secured [Member] \| Financing Receivables, Equal to Greater than 90 Days Past Due [Member]
Loans, past due		1
Consumer Portfolio Segment [Member] \| Consumer Unsecured [Member]
Loans, past due	38	18
Loans, current	4,643	5,736
Loans, net of unearned income	4,681	5,754
Loans Past Due 90 Days or More and Still Accruing	0	0
Nonaccrual	8	0
Consumer Portfolio Segment [Member] \| Consumer Unsecured [Member] \| Financing Receivables 30 to 89 Days Past Due [Member]
Loans, past due	30	18
Consumer Portfolio Segment [Member] \| Consumer Unsecured [Member] \| Financing Receivables, Equal to Greater than 90 Days Past Due [Member]
Loans, past due	$ 8

Recorded investment in financing receivables that are 90 days or more past due and still accruing.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Recorded Investment
-URI http://asc.fasb.org/extlink&oid=65880944

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 7
-Subparagraph (d)
-URI http://asc.fasb.org/extlink&oid=66008989&loc=d3e5111-111524

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Financing receivables that are current.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Recorded Investment
-URI http://asc.fasb.org/extlink&oid=65880944

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
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-Section 50
-Paragraph 7A
-URI http://asc.fasb.org/extlink&oid=66008989&loc=SL6953401-111524

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
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-SubTopic 10
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-URI http://asc.fasb.org/extlink&oid=65884687&loc=d3e4428-111522

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