Note 7 - Loans and Allowance for Loan Losses - Individually Impaired Loans by Class of Loans (Details) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015	Dec. 31, 2015
Real Estate Portfolio Segment [Member] \| Real Estate Construction and Land Development [Member]
Unpaid principal balance	$ 9,395		$ 9,395		$ 9,932
Recorded investment with no allowance	2,904		2,904		3,875
Recorded investment with allowance	3,820		3,820		3,372
Total recorded investment	6,724		6,724		7,247
Allowance for loan losses allocated	572		572		556
Average	7,838	$ 9,650	8,319	$ 10,382
Interest income recognized	88	49	243	265
Cash basis interest recognized	88	47	231	258
Real Estate Portfolio Segment [Member] \| Real Estate Mortgage Residential [Member]
Unpaid principal balance	9,763		9,763		8,655
Recorded investment with no allowance	3,814		3,814		2,502
Recorded investment with allowance	5,979		5,979		6,024
Total recorded investment	9,793		9,793		8,526
Allowance for loan losses allocated	1,358		1,358		1,278
Average	9,214	9,416	8,957	10,199
Interest income recognized	136	109	348	364
Cash basis interest recognized	136	109	323	352
Real Estate Portfolio Segment [Member] \| Real Estate Mortgage Farmland and Other Commercial Enterprises [Member]
Unpaid principal balance	26,429		26,429		20,980
Recorded investment with no allowance	10,986		10,986		4,149
Recorded investment with allowance	15,335		15,335		16,703
Total recorded investment	26,321		26,321		20,852
Allowance for loan losses allocated	335		335		681
Average	26,401	20,999	25,728	22,931
Interest income recognized	292	255	929	780
Cash basis interest recognized	292	252	908	771
Commercial Portfolio Segment [Member] \| Commercial and Industrial [Member]
Unpaid principal balance	409		409		399
Recorded investment with no allowance	22		22
Recorded investment with allowance	387		387		400
Total recorded investment	409		409		400
Allowance for loan losses allocated	209		209		223
Average	409	449	413	563
Interest income recognized	4	5	15	11
Cash basis interest recognized	2	5	13	11
Consumer Portfolio Segment [Member] \| Consumer Unsecured [Member]
Unpaid principal balance	147		147		156
Recorded investment with no allowance
Recorded investment with allowance	148		148		157
Total recorded investment	148		148		157
Allowance for loan losses allocated	147		147		156
Average	150	161	152	118
Interest income recognized	2	2	5	4
Cash basis interest recognized	2	2	4	4
Unpaid principal balance	46,143		46,143		40,122
Recorded investment with no allowance	17,726		17,726		10,526
Recorded investment with allowance	25,669		25,669		26,656
Total recorded investment	43,395		43,395		37,182
Allowance for loan losses allocated	2,621		2,621		$ 2,894
Average	44,012	40,675	43,569	44,193
Interest income recognized	522	420	1,540	1,424
Cash basis interest recognized	$ 520	$ 415	$ 1,479	$ 1,396

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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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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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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