Note 4 - Loans and Allowance for Loan Losses (Details) - Individually Impaired Loans by Class of Loans - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Real Estate
Unpaid principal balance	$ 40,122	$ 47,033
Recorded investment with no allowance	10,526	15,644
Recorded investment with allowance	26,656	28,311
Total recorded investment	37,182	43,955
Allowance for loan losses allocated	2,894	3,371
Average	42,308	53,837	$ 63,986
Interest income recognized	1,703	2,072	2,565
Cash basis interest recognized	1,684	2,037	2,475
Real Estate Portfolio Segment [Member] \| Real Estate Construction and Land Development [Member]
Real Estate
Unpaid principal balance	9,932	13,656
Recorded investment with no allowance	3,875	6,902
Recorded investment with allowance	3,372	3,917
Total recorded investment	7,247	10,819
Allowance for loan losses allocated	556	744
Average	9,409	13,557	17,314
Interest income recognized	343	424	509
Cash basis interest recognized	337	423	461
Real Estate Portfolio Segment [Member] \| Real Estate Mortgage Residential [Member]
Real Estate
Unpaid principal balance	8,655	10,256
Recorded investment with no allowance	2,502	3,473
Recorded investment with allowance	6,024	6,649
Total recorded investment	8,526	10,122
Allowance for loan losses allocated	1,278	1,172
Average	9,810	11,254	12,727
Interest income recognized	448	550	460
Cash basis interest recognized	438	535	445
Real Estate Portfolio Segment [Member] \| Real Estate Mortgage Farmland and Other Commercial Enterprises [Member]
Real Estate
Unpaid principal balance	20,980	23,003
Recorded investment with no allowance	4,149	5,247
Recorded investment with allowance	16,703	17,649
Total recorded investment	20,852	22,896
Allowance for loan losses allocated	681	1,359
Average	22,439	28,711	32,785
Interest income recognized	890	1,088	1,546
Cash basis interest recognized	887	1,070	1,519
Commercial Portfolio Segment [Member] \| Commercial and Industrial [Member]
Real Estate
Unpaid principal balance	399	93
Recorded investment with no allowance		22
Recorded investment with allowance	400	71
Total recorded investment	400	93
Allowance for loan losses allocated	223	71
Average	523	255	994
Interest income recognized	16	6	40
Cash basis interest recognized	16	5	40
Consumer Portfolio Segment [Member] \| Consumer Unsecured [Member]
Real Estate
Unpaid principal balance	156	25
Recorded investment with allowance	157	25
Total recorded investment	157	25
Allowance for loan losses allocated	156	25
Average	127	54	147
Interest income recognized	6	4	9
Cash basis interest recognized	$ 6	4	9
Consumer Portfolio Segment [Member] \| Consumer Secured [Member]
Real Estate
Average		$ 6	19
Interest income recognized			1
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=49124121&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=49124121&loc=d3e5258-111524

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- Definition

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+ 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=49124121&loc=SL6953550-111524

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