Note 8 - 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, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017	Dec. 31, 2017
Unpaid principal balance	$ 22,634		$ 22,634		$ 23,685
Recorded investment with no allowance	6,654		6,654		7,182
Recorded investment with allowance	15,435		15,435		15,959
Total recorded investment	22,089		22,089		23,141
Allowance for loan losses allocated	3,042		3,042		3,182
Average	23,119	$ 40,164	23,338	$ 40,516
Interest income recognized	288	498	579	1,006
Cash basis interest recognized	284	496	566	995
Real Estate Portfolio Segment [Member] \| Real Estate Construction and Land Development [Member]
Unpaid principal balance	3,397		3,397		4,076
Recorded investment with no allowance	1,428		1,428		1,746
Recorded investment with allowance	1,594		1,594		1,955
Total recorded investment	3,022		3,022		3,701
Allowance for loan losses allocated	323		323		402
Average	3,463	4,216	3,539	5,226
Interest income recognized	44	58	90	134
Cash basis interest recognized	44	58	88	133
Real Estate Portfolio Segment [Member] \| Real Estate Mortgage Residential [Member]
Unpaid principal balance	9,952		9,952		10,112
Recorded investment with no allowance	3,079		3,079		3,233
Recorded investment with allowance	6,871		6,871		6,877
Total recorded investment	9,950		9,950		10,110
Allowance for loan losses allocated	2,018		2,018		1,973
Average	10,122	11,080	10,232	10,395
Interest income recognized	137	136	273	254
Cash basis interest recognized	135	134	267	251
Real Estate Portfolio Segment [Member] \| Real Estate Mortgage Farmland and Other Commercial Enterprises [Member]
Unpaid principal balance	8,614		8,614		8,737
Recorded investment with no allowance	2,147		2,147		2,203
Recorded investment with allowance	6,299		6,299		6,367
Total recorded investment	8,446		8,446		8,570
Allowance for loan losses allocated	295		295		319
Average	8,835	24,108	8,861	24,098
Interest income recognized	97	296	197	598
Cash basis interest recognized	95	296	192	592
Commercial Portfolio Segment [Member] \| Commercial and Industrial [Member]
Unpaid principal balance	383		383		448
Recorded investment with no allowance	0		0		0
Recorded investment with allowance	383		383		448
Total recorded investment	383		383		448
Allowance for loan losses allocated	211		211		270
Average	389	409	391	454
Interest income recognized	5	4	10	11
Cash basis interest recognized	5	4	10	11
Commercial Portfolio Segment [Member] \| Commercial Other [Member]
Unpaid principal balance	3		3
Recorded investment with no allowance
Recorded investment with allowance	3		3
Total recorded investment	3		3
Allowance for loan losses allocated	3		3
Average	4	26	2	13
Interest income recognized
Cash basis interest recognized
Consumer Portfolio Segment [Member] \| Consumer Unsecured [Member]
Unpaid principal balance	285		285		312
Recorded investment with no allowance	0		0		0
Recorded investment with allowance	285		285		312
Total recorded investment	285		285		312
Allowance for loan losses allocated	192		192		$ 218
Average	306	325	313	330
Interest income recognized	5	4	9	9
Cash basis interest recognized	$ 5	$ 4	$ 9	$ 8

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://fasb.org/us-gaap/role/ref/legacyRef
-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://fasb.org/us-gaap/role/ref/legacyRef
-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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-Section 50
-Paragraph 14A
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