Note 7 - Loans and Allowance for Loan Losses - Individually Impaired Loans by Class of Loans (Details) - USD ($) $ in Thousands	3 Months Ended
Mar. 31, 2017	Mar. 31, 2016	Dec. 31, 2016
Unpaid principal balance	$ 41,907		$ 44,632
Recorded investment with no allowance	14,581		16,706
Recorded investment with allowance	25,151		25,189
Total recorded investment	39,732		41,895
Allowance for loan losses allocated	3,153		2,948
Average	40,872	$ 41,694
Interest income recognized	508	425
Cash basis interest recognized	468	414
Real Estate Portfolio Segment [Member] \| Real Estate Construction and Land Development [Member]
Unpaid principal balance	8,092		9,076
Recorded investment with no allowance	2,251		2,599
Recorded investment with allowance	3,793		3,800
Total recorded investment	6,044		6,399
Allowance for loan losses allocated	731		759
Average	6,247	8,292
Interest income recognized	76	47
Cash basis interest recognized	52	47
Real Estate Portfolio Segment [Member] \| Real Estate Mortgage Residential [Member]
Unpaid principal balance	9,714		9,930
Recorded investment with no allowance	3,862		4,388
Recorded investment with allowance	5,826		5,590
Total recorded investment	9,688		9,978
Allowance for loan losses allocated	1,499		1,503
Average	9,702	9,035
Interest income recognized	118	103
Cash basis interest recognized	117	99
Real Estate Portfolio Segment [Member] \| Real Estate Mortgage Farmland and Other Commercial Enterprises [Member]
Unpaid principal balance	23,271		25,045
Recorded investment with no allowance	8,468		9,699
Recorded investment with allowance	14,697		15,235
Total recorded investment	23,165		24,934
Allowance for loan losses allocated	337		304
Average	24,089	23,791
Interest income recognized	302	269
Cash basis interest recognized	291	263
Commercial Portfolio Segment [Member] \| Commercial and Industrial [Member]
Unpaid principal balance	496		435
Recorded investment with no allowance	0		20
Recorded investment with allowance	498		418
Total recorded investment	498		438
Allowance for loan losses allocated	252		236
Average	499	420
Interest income recognized	7	4
Cash basis interest recognized	6	4
Consumer Portfolio Segment [Member] \| Consumer Unsecured [Member]
Unpaid principal balance	334		146
Recorded investment with no allowance	0		0
Recorded investment with allowance	337		146
Total recorded investment	337		146
Allowance for loan losses allocated	334		$ 146
Average	335	156
Interest income recognized	5	2
Cash basis interest recognized	$ 2	$ 1

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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