Note 7 - Loans and Allowance for Loan Losses - Individually Impaired Loans by Class of Loans (Details) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016	Dec. 31, 2016
Unpaid principal balance	$ 39,918		$ 39,918		$ 44,632
Recorded investment with no allowance	14,582		14,582		16,706
Recorded investment with allowance	24,614		24,614		25,189
Total recorded investment	39,196		39,196		41,895
Allowance for loan losses allocated	2,880		2,880		2,948
Average	40,164	$ 44,996	40,516	$ 43,345
Interest income recognized	498	593	1,006	1,018
Cash basis interest recognized	496	545	995	959
Real Estate Portfolio Segment [Member] \| Real Estate Construction and Land Development [Member]
Unpaid principal balance	4,859		4,859		9,076
Recorded investment with no allowance	2,188		2,188		2,599
Recorded investment with allowance	2,043		2,043		3,800
Total recorded investment	4,231		4,231		6,399
Allowance for loan losses allocated	406		406		759
Average	4,216	8,832	5,226	8,562
Interest income recognized	58	108	134	155
Cash basis interest recognized	58	96	133	143
Real Estate Portfolio Segment [Member] \| Real Estate Mortgage Residential [Member]
Unpaid principal balance	11,077		11,077		9,930
Recorded investment with no allowance	3,890		3,890		4,388
Recorded investment with allowance	7,211		7,211		5,590
Total recorded investment	11,101		11,101		9,978
Allowance for loan losses allocated	1,720		1,720		1,503
Average	11,080	8,619	10,395	8,827
Interest income recognized	136	109	254	212
Cash basis interest recognized	134	88	251	187
Real Estate Portfolio Segment [Member] \| Real Estate Mortgage Farmland and Other Commercial Enterprises [Member]
Unpaid principal balance	23,223		23,223		25,045
Recorded investment with no allowance	8,504		8,504		9,699
Recorded investment with allowance	14,600		14,600		15,235
Total recorded investment	23,104		23,104		24,934
Allowance for loan losses allocated	280		280		304
Average	24,108	26,985	24,098	25,388
Interest income recognized	296	368	598	637
Cash basis interest recognized	296	353	592	616
Commercial Portfolio Segment [Member] \| Commercial and Industrial [Member]
Unpaid principal balance	405		405		435
Recorded investment with no allowance	0		0		20
Recorded investment with allowance	406		406		418
Total recorded investment	406		406		438
Allowance for loan losses allocated	225		225		236
Average	409	410	454	415
Interest income recognized	4	7	11	11
Cash basis interest recognized	4	7	11	11
Commercial Portfolio Segment [Member] \| Commercial Other [Member]
Unpaid principal balance	25		25
Recorded investment with no allowance
Recorded investment with allowance	25		25
Total recorded investment	25		25
Allowance for loan losses allocated	13		13
Average	26	0	13	0
Interest income recognized	0	0	0	0
Cash basis interest recognized	0	0	0	0
Consumer Portfolio Segment [Member] \| Consumer Unsecured [Member]
Unpaid principal balance	329		329		146
Recorded investment with no allowance	0		0		0
Recorded investment with allowance	329		329		146
Total recorded investment	329		329		146
Allowance for loan losses allocated	236		236		$ 146
Average	325	150	330	153
Interest income recognized	4	1	9	3
Cash basis interest recognized	$ 4	$ 1	$ 8	$ 2

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=84173941&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=84173941&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=84173941&loc=SL6953550-111524

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