Note 7 - Loans and Allowance for Loan Losses - Individually Impaired Loans by Class of Loans (Details) - USD ($)	3 Months Ended	6 Months Ended
Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015	Dec. 31, 2015
Real Estate Portfolio Segment [Member] \| Real Estate Construction and Land Development [Member]
Unpaid principal balance	$ 9,602		$ 9,602		$ 9,932
Recorded investment with no allowance	3,090		3,090		3,875
Recorded investment with allowance	3,849		3,849		3,372
Total recorded investment	6,939		6,939		7,247
Allowance for loan losses allocated	598		598		556
Average	8,832	$ 10,388	8,562	$ 10,754
Interest income recognized	108	135	155	216
Cash basis interest recognized	96	131	143	211
Real Estate Portfolio Segment [Member] \| Real Estate Mortgage Residential [Member]
Unpaid principal balance	9,032		9,032		8,655
Recorded investment with no allowance	3,347		3,347		2,502
Recorded investment with allowance	5,716		5,716		6,024
Total recorded investment	9,063		9,063		8,526
Allowance for loan losses allocated	1,500		1,500		1,278
Average	8,619	10,739	8,827	10,597
Interest income recognized	109	134	212	255
Cash basis interest recognized	88	122	187	243
Real Estate Portfolio Segment [Member] \| Real Estate Mortgage Farmland and Other Commercial Enterprises [Member]
Unpaid principal balance	26,838		26,838		20,980
Recorded investment with no allowance	10,879		10,879		4,149
Recorded investment with allowance	15,855		15,855		16,703
Total recorded investment	26,734		26,734		20,852
Allowance for loan losses allocated	454		454		681
Average	26,985	22,426	25,388	23,913
Interest income recognized	368	245	637	525
Cash basis interest recognized	353	242	616	519
Commercial Portfolio Segment [Member] \| Commercial and Industrial [Member]
Unpaid principal balance	411		411		399
Recorded investment with no allowance	22		22		0
Recorded investment with allowance	389		389		400
Total recorded investment	411		411		400
Allowance for loan losses allocated	211		211		223
Average	410	805	415	621
Interest income recognized	7	5	11	6
Cash basis interest recognized	7	5	11	6
Consumer Portfolio Segment [Member] \| Consumer Unsecured [Member]
Unpaid principal balance	151		151		156
Recorded investment with no allowance	0		0		0
Recorded investment with allowance	151		151		157
Total recorded investment	151		151		157
Allowance for loan losses allocated	151		151		156
Average	150	167	153	96
Interest income recognized	1	2	3	2
Cash basis interest recognized	1	2	2	2
Unpaid principal balance	46,034		46,034		40,122
Recorded investment with no allowance	17,338		17,338		10,526
Recorded investment with allowance	25,960		25,960		26,656
Total recorded investment	43,298		43,298		37,182
Allowance for loan losses allocated	2,914		2,914		$ 2,894
Average	44,996	44,525	43,345	45,981
Interest income recognized	593	521	1,018	1,004
Cash basis interest recognized	$ 545	$ 502	$ 959	$ 981

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=66008989&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=66008989&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=66008989&loc=SL6953550-111524

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+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Recorded Investment
-URI http://asc.fasb.org/extlink&oid=65880944

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 15
-Subparagraph (a)(3)
-URI http://asc.fasb.org/extlink&oid=66008989&loc=d3e5212-111524

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