Note 7 - Loans and Allowance for Loan Losses - Major Classifications of Loans (Details) - USD ($)	Sep. 30, 2016	Dec. 31, 2015
Real Estate Portfolio Segment [Member] \| Real Estate Construction and Land Development [Member]
Loan receivable	$ 114,454,000	$ 115,516,000
Loans, net of unearned income	114,454,000	115,516,000
Real Estate Portfolio Segment [Member] \| Real Estate Mortgage Residential [Member]
Loan receivable	341,160,000	355,134,000
Loans, net of unearned income	341,160,000	355,134,000
Real Estate Portfolio Segment [Member] \| Real Estate Mortgage Farmland and Other Commercial Enterprises [Member]
Loan receivable	393,973,000	386,386,000
Loans, net of unearned income	393,973,000	386,386,000
Real Estate Portfolio Segment [Member]
Loans, net of unearned income	849,587,000	857,036,000
Commercial Portfolio Segment [Member] \| Commercial and Industrial [Member]
Loan receivable	47,706,000	48,379,000
Loans, net of unearned income	47,706,000	48,379,000
Commercial Portfolio Segment [Member] \| States and Political Subdivisions [Member]
Loan receivable	19,922,000	17,643,000
Loans, net of unearned income	19,922,000	17,643,000
Commercial Portfolio Segment [Member] \| Commercial Other [Member]
Loan receivable	23,666,000	23,798,000
Loans, net of unearned income	23,666,000	23,798,000
Commercial Portfolio Segment [Member]
Loans, net of unearned income	91,294,000	89,820,000
Consumer Portfolio Segment [Member] \| Consumer Secured [Member]
Loan receivable	4,597,000	6,665,000
Loans, net of unearned income	4,597,000	6,665,000
Consumer Portfolio Segment [Member] \| Consumer Unsecured [Member]
Loan receivable	5,238,000	5,754,000
Loans, net of unearned income	5,238,000	5,754,000
Consumer Portfolio Segment [Member]
Loans, net of unearned income	9,835,000	12,419,000
Loan receivable	950,716,000	959,275,000
Less unearned income	0	0
Loans, net of unearned income	$ 950,716,000	$ 959,275,000

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=65890831&loc=d3e10152-111534

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 4
-URI http://asc.fasb.org/extlink&oid=66008989&loc=d3e5074-111524

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
-Topic 840
-SubTopic 30
-Section 50
-Paragraph 4
-Subparagraph (a)(4)
-URI http://asc.fasb.org/extlink&oid=25496975&loc=d3e45377-112738

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- Definition

Amount before allowance of loans and leases held in portfolio, including but not limited to, commercial and consumer loans. Includes deferred interest and fees, undisbursed portion of loan balance, unamortized costs and premiums and discounts from face amounts. Excludes loans and leases covered under loss sharing agreements.

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Amount before allowance and after deduction of deferred interest and fees, unamortized costs and premiums and discounts from face amounts, of loans and leases held in portfolio, including but not limited to, commercial and consumer loans. Excludes loans and leases covered under loss sharing agreements.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 45
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=65884687&loc=d3e4428-111522

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-URI http://asc.fasb.org/extlink&oid=66008989&loc=d3e5074-111524

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