Note 4 - Loans and Allowance for Loan Losses - Major Classifications of Loans (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Loan receivable	$ 1,035,263	$ 970,975
Less unearned income	0	0
Loans, net of unearned income	1,035,263	970,975
Real Estate Portfolio Segment [Member]
Loans, net of unearned income	916,806	870,892
Real Estate Portfolio Segment [Member] \| Real Estate Construction and Land Development [Member]
Loan receivable	129,181	120,230
Loans, net of unearned income	129,181	120,230
Real Estate Portfolio Segment [Member] \| Real Estate Mortgage Residential [Member]
Loan receivable	355,304	350,295
Loans, net of unearned income	355,304	350,295
Real Estate Portfolio Segment [Member] \| Real Estate Mortgage Farmland and Other Commercial Enterprises [Member]
Loan receivable	432,321	400,367
Loans, net of unearned income	432,321	400,367
Commercial Portfolio Segment [Member]
Loans, net of unearned income	110,542	90,848
Commercial Portfolio Segment [Member] \| Commercial and Industrial [Member]
Loan receivable	63,417	48,607
Loans, net of unearned income	63,417	48,607
Commercial Portfolio Segment [Member] \| States and Political Subdivisions [Member]
Loan receivable	27,209	18,933
Loans, net of unearned income	27,209	18,933
Commercial Portfolio Segment [Member] \| Commercial Other [Member]
Loan receivable	19,916	23,308
Loans, net of unearned income	19,916	23,308
Consumer Portfolio Segment [Member]
Loans, net of unearned income	7,915	9,235
Consumer Portfolio Segment [Member] \| Consumer Secured [Member]
Loan receivable	4,853	4,554
Loans, net of unearned income	4,853	4,554
Consumer Portfolio Segment [Member] \| Consumer Unsecured [Member]
Loan receivable	3,062	4,681
Loans, net of unearned income	$ 3,062	$ 4,681

Amount of deferred interest and fee income, unamortized costs incurred to originate loans and leases, unamortized loan commitments and loan syndication fees, and premiums over or discounts from face amounts of acquired loans. Excludes amounts for loans and leases covered under loss sharing agreements.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 20
-Section 50
-Paragraph 3
-URI http://asc.fasb.org/extlink&oid=84159169&loc=d3e10152-111534

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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-Section 50
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Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03.7)
-URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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-SubTopic 30
-Section 50
-Paragraph 4
-Subparagraph (a)(4)
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