Note 7 - Loans and Allowance for Loan Losses (Details) - Individually Impaired Loans by Class of Loans - USD ($) $ in Thousands	3 Months Ended
Mar. 31, 2016	Mar. 31, 2015	Dec. 31, 2015
Real Estate
Unpaid principal balance	$ 42,799		$ 40,122
Recorded investment with no allowance	13,626		10,526
Recorded investment with allowance	26,338		26,656
Total recorded investment	39,964		37,182
Allowance for loan losses allocated	2,689		2,894
Average	41,694	$ 47,453
Interest income recognized	425	483
Cash basis interest recognized	414	479
Real Estate Portfolio Segment [Member] \| Real Estate Construction and Land Development [Member]
Real Estate
Unpaid principal balance	9,602		9,932
Recorded investment with no allowance	3,582		3,875
Recorded investment with allowance	3,358		3,372
Total recorded investment	6,940		7,247
Allowance for loan losses allocated	538		556
Average	8,292	11,124
Interest income recognized	47	81
Cash basis interest recognized	47	80
Real Estate Portfolio Segment [Member] \| Real Estate Mortgage Residential [Member]
Real Estate
Unpaid principal balance	8,970		8,655
Recorded investment with no allowance	2,897		2,502
Recorded investment with allowance	6,028		6,024
Total recorded investment	8,925		8,526
Allowance for loan losses allocated	1,248		1,278
Average	9,035	10,453
Interest income recognized	103	121
Cash basis interest recognized	99	121
Real Estate Portfolio Segment [Member] \| Real Estate Mortgage Farmland and Other Commercial Enterprises [Member]
Real Estate
Unpaid principal balance	23,655		20,980
Recorded investment with no allowance	7,124		4,149
Recorded investment with allowance	16,402		16,703
Total recorded investment	23,526		20,852
Allowance for loan losses allocated	530		681
Average	23,791	25,417
Interest income recognized	269	280
Cash basis interest recognized	263	277
Commercial Portfolio Segment [Member] \| Commercial and Industrial [Member]
Real Estate
Unpaid principal balance	418		399
Recorded investment with no allowance	23		0
Recorded investment with allowance	396		400
Total recorded investment	419		400
Allowance for loan losses allocated	219		223
Average	420	435
Interest income recognized	4	1
Cash basis interest recognized	4	1
Consumer Portfolio Segment [Member] \| Consumer Unsecured [Member]
Real Estate
Unpaid principal balance	154		156
Recorded investment with no allowance	0		0
Recorded investment with allowance	154		157
Total recorded investment	154		157
Allowance for loan losses allocated	154		$ 156
Average		24
Interest income recognized		0
Cash basis interest recognized		$ 0
Consumer Portfolio Segment [Member] \| Consumer Secured [Member]
Real Estate
Average	156
Interest income recognized	2
Cash basis interest recognized	$ 1

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- Definition

Average amount of investment of impaired financing receivables with related allowance for credit losses and without a related allowance for credit losses.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 15
-Subparagraph (c)(1)
-URI http://asc.fasb.org/extlink&oid=66008989&loc=d3e5212-111524

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 17
-URI http://asc.fasb.org/extlink&oid=66008989&loc=d3e5258-111524

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- Definition

Amount of interest income recognized that the financing receivables (with related allowance for credit losses and without a related allowance for credit losses) were impaired.

+ References

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+ References

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+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 14A
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=66008989&loc=SL6953550-111524

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+ References

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 15
-Subparagraph (a)(3)
-URI http://asc.fasb.org/extlink&oid=66008989&loc=d3e5212-111524

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