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, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016	Dec. 31, 2016
Unpaid principal balance	$ 35,228		$ 35,228		$ 44,632
Recorded investment with no allowance	9,152		9,152		16,706
Recorded investment with allowance	25,377		25,377		25,189
Total recorded investment	34,529		34,529		41,895
Allowance for loan losses allocated	2,788		2,788		2,948
Average	36,031	$ 44,012	39,004	$ 43,569
Interest income recognized	425	522	1,431	1,540
Cash basis interest recognized	395	520	1,390	1,479
Real Estate Portfolio Segment [Member] \| Real Estate Construction and Land Development [Member]
Unpaid principal balance	4,569		4,569		9,076
Recorded investment with no allowance	2,003		2,003		2,599
Recorded investment with allowance	1,962		1,962		3,800
Total recorded investment	3,965		3,965		6,399
Allowance for loan losses allocated	385		385		759
Average	5,932	7,838	5,464	8,319
Interest income recognized	52	88	186	243
Cash basis interest recognized	28	88	161	231
Real Estate Portfolio Segment [Member] \| Real Estate Mortgage Residential [Member]
Unpaid principal balance	9,985		9,985		9,930
Recorded investment with no allowance	2,807		2,807		4,388
Recorded investment with allowance	7,207		7,207		5,590
Total recorded investment	10,014		10,014		9,978
Allowance for loan losses allocated	1,650		1,650		1,503
Average	10,199	9,214	10,329	8,957
Interest income recognized	139	136	393	348
Cash basis interest recognized	134	136	385	323
Real Estate Portfolio Segment [Member] \| Real Estate Mortgage Farmland and Other Commercial Enterprises [Member]
Unpaid principal balance	19,961		19,961		25,045
Recorded investment with no allowance	4,342		4,342		9,699
Recorded investment with allowance	15,494		15,494		15,235
Total recorded investment	19,836		19,836		24,934
Allowance for loan losses allocated	313		313		304
Average	19,166	26,401	22,436	25,728
Interest income recognized	224	292	822	929
Cash basis interest recognized	223	292	815	908
Commercial Portfolio Segment [Member] \| Commercial and Industrial [Member]
Unpaid principal balance	400		400		435
Recorded investment with no allowance	0		0		20
Recorded investment with allowance	401		401		418
Total recorded investment	401		401		438
Allowance for loan losses allocated	219		219		236
Average	401	409	436	413
Interest income recognized	6	4	17	15
Cash basis interest recognized	6	2	17	13
Commercial Portfolio Segment [Member] \| Commercial Other [Member]
Average			8	0
Interest income recognized			0	0
Cash basis interest recognized			0	0
Consumer Portfolio Segment [Member] \| Consumer Unsecured [Member]
Unpaid principal balance	313		313		146
Recorded investment with no allowance	0		0		0
Recorded investment with allowance	313		313		146
Total recorded investment	313		313		146
Allowance for loan losses allocated	221		221		$ 146
Average	333	150	331	152
Interest income recognized	4	2	13	5
Cash basis interest recognized	$ 4	$ 2	$ 12	$ 4

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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