Note 4 - Loans and Allowance for Loan Losses - Recorded Investment In Nonperforming Loans by Class of Loans (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Nonaccrual	$ 3,887	$ 6,423
Restructured Loans	11,482	22,942
Loans Past Due 90 Days or More and Still Accruing	0	0
Real Estate Portfolio Segment [Member] \| Real Estate Construction and Land Development [Member]
Nonaccrual	151	712
Restructured Loans	1,955	3,637
Loans Past Due 90 Days or More and Still Accruing	0	0
Real Estate Portfolio Segment [Member] \| Real Estate Mortgage Residential [Member]
Nonaccrual	1,763	2,316
Restructured Loans	5,326	4,006
Loans Past Due 90 Days or More and Still Accruing	0	0
Real Estate Portfolio Segment [Member] \| Real Estate Mortgage Farmland and Other Commercial Enterprises [Member]
Nonaccrual	1,752	3,383
Restructured Loans	3,703	14,787
Loans Past Due 90 Days or More and Still Accruing	0	0
Commercial Portfolio Segment [Member] \| Commercial and Industrial [Member]
Nonaccrual	53	0
Restructured Loans	370	377
Loans Past Due 90 Days or More and Still Accruing	0	0
Consumer Portfolio Segment [Member] \| Consumer Unsecured [Member]
Nonaccrual	168	8
Restructured Loans	128	135
Loans Past Due 90 Days or More and Still Accruing	0	0
Consumer Portfolio Segment [Member] \| Consumer Secured [Member]
Nonaccrual	0	4
Restructured Loans		0
Loans Past Due 90 Days or More and Still Accruing	$ 0	$ 0

The amount of the outstanding recorded investment related to financing receivables that have been modified by troubled debt restructurings.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 40
-Section 50
-Paragraph 4
-URI http://asc.fasb.org/extlink&oid=82895541&loc=d3e18845-111554

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- Definition

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

+ References

Reference 1: 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=84173941&loc=d3e5111-111524

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- Definition

Recorded investment in financing receivables that are on nonaccrual status as of the balance sheet date.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 7
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=84173941&loc=d3e5111-111524

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