Note 3 - Loans and Allowance for Loan Losses - Allowance for Loan Losses (Details) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Dec. 31, 2016
Individually evaluated for impairment					$ 75	$ 85
Collectively evaluated for impairment					3,451	3,301
Collectively evaluated for impairment					3,451	3,301
Ending balance	$ 3,526	$ 3,319	$ 3,526	$ 3,189	3,526	3,386
Ending balance	3,526	3,189	3,526	3,189
Beginning balance	3,418	3,319	3,386	3,415
Provision for loan losses	256	150	467	225
Charge-offs	(200)	(331)	(488)	(555)
Recoveries	52	51	161	104
Receivables Acquired with Deteriorated Credit Quality [Member]
Ending balance	0		0		0	0
Ending balance	0		0
Beginning balance			0
Real Estate Mortgage Portfolio Segment [Member] \| Residential Loan [Member]
Individually evaluated for impairment					17	23
Collectively evaluated for impairment					195	357
Collectively evaluated for impairment					195	357
Ending balance	212	470	212	408	212	380
Ending balance	212	408	212	408
Beginning balance	271	470	380	527
Provision for loan losses	(61)	(13)	(146)	(42)
Charge-offs	(6)	(54)	(46)	(94)
Recoveries	8	5	24	17
Real Estate Mortgage Portfolio Segment [Member] \| Residential Loan [Member] \| Receivables Acquired with Deteriorated Credit Quality [Member]
Ending balance	0		0		0	0
Ending balance	0		0
Beginning balance			0
Real Estate Mortgage Portfolio Segment [Member] \| Land Loan [Member]
Individually evaluated for impairment					0	0
Collectively evaluated for impairment					124	56
Collectively evaluated for impairment					124	56
Ending balance	124	84	124	47	124	56
Ending balance	124	47	124	47
Beginning balance	109	84	56	157
Provision for loan losses	15	(37)	68	(101)
Charge-offs	0	0	0	(9)
Recoveries	0	0	0	0
Real Estate Mortgage Portfolio Segment [Member] \| Land Loan [Member] \| Receivables Acquired with Deteriorated Credit Quality [Member]
Ending balance	0		0		0	0
Ending balance	0		0
Beginning balance			0
Real Estate Mortgage Portfolio Segment [Member] \| Construction Loans [Member]
Individually evaluated for impairment					0	0
Collectively evaluated for impairment					306	80
Collectively evaluated for impairment					306	80
Ending balance	306	45	306	42	306	80
Ending balance	306	42	306	42
Beginning balance	223	45	80	47
Provision for loan losses	83	(3)	226	(5)
Charge-offs	0	0	0	0
Recoveries	0	0	0	0
Real Estate Mortgage Portfolio Segment [Member] \| Construction Loans [Member] \| Receivables Acquired with Deteriorated Credit Quality [Member]
Ending balance	0		0		0	0
Ending balance	0		0
Beginning balance			0
Real Estate Mortgage Portfolio Segment [Member] \| Commercial Real Estate Loan [Member]
Individually evaluated for impairment					0	0
Collectively evaluated for impairment					1,583	1,670
Collectively evaluated for impairment					1,583	1,670
Ending balance	1,583	1,468	1,583	1,473	1,583	1,670
Ending balance	1,583	1,473	1,583	1,473
Beginning balance	1,585	1,468	1,670	1,541
Provision for loan losses	(4)	73	(132)	(4)
Charge-offs	(2)	(82)	(3)	(82)
Recoveries	4	14	48	18
Real Estate Mortgage Portfolio Segment [Member] \| Commercial Real Estate Loan [Member] \| Receivables Acquired with Deteriorated Credit Quality [Member]
Ending balance	0		0		0	0
Ending balance	0		0
Beginning balance			0
Commercial Portfolio Segment [Member]
Individually evaluated for impairment					40	43
Collectively evaluated for impairment					250	155
Collectively evaluated for impairment					250	155
Ending balance	290	273	290	162	290	198
Ending balance	290	162	290	162
Beginning balance	244	273	198	261
Provision for loan losses	46	(13)	131	12
Charge-offs	0	(100)	(43)	(114)
Recoveries	0	2	4	3
Commercial Portfolio Segment [Member] \| Receivables Acquired with Deteriorated Credit Quality [Member]
Ending balance	0		0		0	0
Ending balance	0		0
Beginning balance			0
Consumer Portfolio Segment [Member] \| Home Equity and Second Mortgage [Member]
Individually evaluated for impairment					14	13
Collectively evaluated for impairment					666	670
Collectively evaluated for impairment					666	670
Ending balance	680	721	680	791	680	683
Ending balance	680	791	680	791
Beginning balance	698	721	683	626
Provision for loan losses	(13)	66	1	192
Charge-offs	(6)	0	(6)	(36)
Recoveries	1	4	2	9
Consumer Portfolio Segment [Member] \| Home Equity and Second Mortgage [Member] \| Receivables Acquired with Deteriorated Credit Quality [Member]
Ending balance	0		0		0	0
Ending balance	0		0
Beginning balance			0
Consumer Portfolio Segment [Member] \| Other Consumer Loan [Member]
Individually evaluated for impairment					4	6
Collectively evaluated for impairment					327	313
Collectively evaluated for impairment					327	313
Ending balance	331	258	331	266	331	319
Ending balance	331	266	331	266
Beginning balance	288	258	319	256
Provision for loan losses	190	77	319	173
Charge-offs	(186)	(95)	(390)	(220)
Recoveries	39	$ 26	83	$ 57
Consumer Portfolio Segment [Member] \| Other Consumer Loan [Member] \| Receivables Acquired with Deteriorated Credit Quality [Member]
Ending balance	0		0		$ 0	$ 0
Ending balance	$ 0		0
Beginning balance			$ 0

A valuation allowance for financing receivables that are expected to be uncollectible.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 11B
-Subparagraph (c)(1)
-URI http://asc.fasb.org/extlink&oid=84173941&loc=SL6953423-111524

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The valuation allowance for financing receivables that are expected to be uncollectible that were collectively evaluated for impairment.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 11B
-Subparagraph (g)
-URI http://asc.fasb.org/extlink&oid=84173941&loc=SL6953423-111524

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- Definition

Amount of valuation allowance for financing receivables that are expected to be uncollectible that were individually evaluated for impairment.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 11B
-Subparagraph (g)
-URI http://asc.fasb.org/extlink&oid=84173941&loc=SL6953423-111524

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- Definition

Amount of recovery of financing receivables doubtful of collection that were previously charged off.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 11B
-Subparagraph (c)(4)
-URI http://asc.fasb.org/extlink&oid=84173941&loc=SL6953423-111524

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- Definition

Amount of direct write-downs of financing receivables charged against the allowance.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 11B
-Subparagraph (c)(3)
-URI http://asc.fasb.org/extlink&oid=84173941&loc=SL6953423-111524

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- Definition

Amount of expense related to estimated loss from loan and lease transactions.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 225
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-04.11)
-URI http://asc.fasb.org/extlink&oid=6879574&loc=d3e536633-122882

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3602-108585

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
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-URI http://asc.fasb.org/extlink&oid=84173941&loc=SL6953423-111524

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