Note 8 - Loans and Allowance for Loan Losses - Individually Impaired Loans by Class of Loans (Details) - USD ($) $ in Thousands	3 Months Ended
Mar. 31, 2018	Mar. 31, 2017	Dec. 31, 2017
Unpaid principal balance	$ 23,021		$ 23,685
Recorded investment with no allowance	6,726		7,182
Recorded investment with allowance	15,751		15,959
Total recorded investment	22,477		23,141
Allowance for loan losses allocated	3,173		3,182
Average	23,559	$ 40,872
Interest income recognized	291	508
Cash basis interest recognized	263	468
Real Estate Portfolio Segment [Member] \| Real Estate Construction and Land Development [Member]
Unpaid principal balance	3,473		4,076
Recorded investment with no allowance	1,501		1,746
Recorded investment with allowance	1,597		1,955
Total recorded investment	3,098		3,701
Allowance for loan losses allocated	325		402
Average	3,616	6,247
Interest income recognized	46	76
Cash basis interest recognized	26	52
Real Estate Portfolio Segment [Member] \| Real Estate Mortgage Residential [Member]
Unpaid principal balance	10,177		10,112
Recorded investment with no allowance	3,056		3,233
Recorded investment with allowance	7,120		6,877
Total recorded investment	10,176		10,110
Allowance for loan losses allocated	2,115		1,973
Average	10,343	9,702
Interest income recognized	136	118
Cash basis interest recognized	133	117
Real Estate Portfolio Segment [Member] \| Real Estate Mortgage Farmland and Other Commercial Enterprises [Member]
Unpaid principal balance	8,675		8,737
Recorded investment with no allowance	2,169		2,203
Recorded investment with allowance	6,338		6,367
Total recorded investment	8,507		8,570
Allowance for loan losses allocated	307		319
Average	8,887	24,089
Interest income recognized	100	302
Cash basis interest recognized	96	291
Commercial Portfolio Segment [Member] \| Commercial and Industrial [Member]
Unpaid principal balance	391		448
Recorded investment with no allowance	0		0
Recorded investment with allowance	391		448
Total recorded investment	391		448
Allowance for loan losses allocated	214		270
Average	393	499
Interest income recognized	5	7
Cash basis interest recognized	4	6
Consumer Portfolio Segment [Member] \| Consumer Unsecured [Member]
Unpaid principal balance	305		312
Recorded investment with no allowance	0		0
Recorded investment with allowance	305		312
Total recorded investment	305		312
Allowance for loan losses allocated	212		$ 218
Average	320	335
Interest income recognized	4	5
Cash basis interest recognized	$ 4	$ 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://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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-SubTopic 10
-Section 50
-Paragraph 14A
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=84173941&loc=SL6953550-111524

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