Note 4 - Loans and Allowance for Loan Losses - Individually Impaired Loans by Class of Loans (Details) - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Unpaid principal balance	$ 44,632	$ 40,122
Recorded investment with no allowance	16,706	10,526
Recorded investment with allowance	25,189	26,656
Total recorded investment	41,895	37,182
Allowance for loan losses allocated	2,948	2,894
Average	42,979	42,308	$ 53,837
Interest income recognized	2,028	1,703	2,072
Cash basis interest recognized	1,943	1,684	2,037
Real Estate Portfolio Segment [Member] \| Real Estate Construction and Land Development [Member]
Unpaid principal balance	9,076	9,932
Recorded investment with no allowance	2,599	3,875
Recorded investment with allowance	3,800	3,372
Total recorded investment	6,399	7,247
Allowance for loan losses allocated	759	556
Average	7,706	9,409	13,557
Interest income recognized	310	343	424
Cash basis interest recognized	298	337	423
Real Estate Portfolio Segment [Member] \| Real Estate Mortgage Residential [Member]
Unpaid principal balance	9,930	8,655
Recorded investment with no allowance	4,388	2,502
Recorded investment with allowance	5,590	6,024
Total recorded investment	9,978	8,526
Allowance for loan losses allocated	1,503	1,278
Average	9,146	9,810	11,254
Interest income recognized	491	448	550
Cash basis interest recognized	465	438	535
Real Estate Portfolio Segment [Member] \| Real Estate Mortgage Farmland and Other Commercial Enterprises [Member]
Unpaid principal balance	25,045	20,980
Recorded investment with no allowance	9,699	4,149
Recorded investment with allowance	15,235	16,703
Total recorded investment	24,934	20,852
Allowance for loan losses allocated	304	681
Average	25,557	22,439	28,711
Interest income recognized	1,197	890	1,088
Cash basis interest recognized	1,153	887	1,070
Commercial Portfolio Segment [Member] \| Commercial and Industrial [Member]
Unpaid principal balance	435	399
Recorded investment with no allowance	20
Recorded investment with allowance	418	400
Total recorded investment	438	400
Allowance for loan losses allocated	236	223
Average	419	523	255
Interest income recognized	23	16	6
Cash basis interest recognized	21	16	5
Consumer Portfolio Segment [Member] \| Consumer Unsecured [Member]
Unpaid principal balance	146	156
Recorded investment with no allowance
Recorded investment with allowance	146	157
Total recorded investment	146	157
Allowance for loan losses allocated	146	156
Average	151	127	54
Interest income recognized	7	6	4
Cash basis interest recognized	$ 6	$ 6	4
Consumer Portfolio Segment [Member] \| Consumer Secured [Member]
Average			6
Interest income recognized
Cash basis interest recognized

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

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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+ 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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