Note 3 - Loans and Allowance for Loan Losses - Allowance for Loan Losses (Details) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Dec. 31, 2016
Individually evaluated for impairment					$ 37	$ 85
Collectively evaluated for impairment					3,496	3,301
Ending balance	$ 3,537	$ 3,189	$ 3,537	$ 3,320	3,537	3,386
Collectively evaluated for impairment					3,496	3,301
Beginning balance	3,526	3,189	3,386	3,415
Provision for loan losses	150	200	617	425
Charge-offs	(206)	(120)	(694)	(674)
Recoveries	67	51	228	154
Ending balance	3,537	3,320	3,537	3,320
Receivables Acquired with Deteriorated Credit Quality [Member]
Ending balance	4		4		4	0
Beginning balance			0
Ending balance	4		4
Real Estate Mortgage Portfolio Segment [Member] \| Residential Loan [Member]
Individually evaluated for impairment					24	23
Collectively evaluated for impairment					176	357
Ending balance	204	408	204	382	204	380
Collectively evaluated for impairment					176	357
Beginning balance	212	408	380	527
Provision for loan losses	(9)	(29)	(155)	(70)
Charge-offs	(2)	(14)	(48)	(108)
Recoveries	3	17	27	33
Ending balance	204	382	204	382
Real Estate Mortgage Portfolio Segment [Member] \| Residential Loan [Member] \| Receivables Acquired with Deteriorated Credit Quality [Member]
Ending balance	4		4		4	0
Beginning balance			0
Ending balance	4		4
Real Estate Mortgage Portfolio Segment [Member] \| Land Loan [Member]
Individually evaluated for impairment					0	0
Collectively evaluated for impairment					126	56
Ending balance	126	47	126	49	126	56
Collectively evaluated for impairment					126	56
Beginning balance	124	47	56	157
Provision for loan losses	2	2	70	(99)
Charge-offs	0	0	0	(9)
Recoveries	0	0	0	0
Ending balance	126	49	126	49
Real Estate Mortgage Portfolio Segment [Member] \| Land Loan [Member] \| Receivables Acquired with Deteriorated Credit Quality [Member]
Ending balance	0		0		0	0
Beginning balance			0
Ending balance	0		0
Real Estate Mortgage Portfolio Segment [Member] \| Construction Loans [Member]
Individually evaluated for impairment					0	0
Collectively evaluated for impairment					261	80
Ending balance	261	42	261	63	261	80
Collectively evaluated for impairment					261	80
Beginning balance	306	42	80	47
Provision for loan losses	(45)	21	181	16
Charge-offs	0	0	0	0
Recoveries	0	0	0	0
Ending balance	261	63	261	63
Real Estate Mortgage Portfolio Segment [Member] \| Construction Loans [Member] \| Receivables Acquired with Deteriorated Credit Quality [Member]
Ending balance	0		0		0	0
Beginning balance			0
Ending balance	0		0
Real Estate Mortgage Portfolio Segment [Member] \| Commercial Real Estate Loan [Member]
Individually evaluated for impairment					0	0
Collectively evaluated for impairment					1,591	1,670
Ending balance	1,591	1,473	1,591	1,576	1,591	1,670
Collectively evaluated for impairment					1,591	1,670
Beginning balance	1,583	1,473	1,670	1,541
Provision for loan losses	(15)	100	(147)	96
Charge-offs	0	0	(3)	(82)
Recoveries	23	3	71	21
Ending balance	1,591	1,576	1,591	1,576
Real Estate Mortgage Portfolio Segment [Member] \| Commercial Real Estate Loan [Member] \| Receivables Acquired with Deteriorated Credit Quality [Member]
Ending balance	0		0		0	0
Beginning balance			0
Ending balance	0		0
Commercial Portfolio Segment [Member]
Individually evaluated for impairment					0	43
Collectively evaluated for impairment					235	155
Ending balance	235	162	235	141	235	198
Collectively evaluated for impairment					235	155
Beginning balance	290	162	198	261
Provision for loan losses	(8)	(21)	123	(9)
Charge-offs	(47)	0	(90)	(114)
Recoveries	0	0	4	3
Ending balance	235	141	235	141
Commercial Portfolio Segment [Member] \| Receivables Acquired with Deteriorated Credit Quality [Member]
Ending balance	0		0		0	0
Beginning balance			0
Ending balance	0		0
Consumer Portfolio Segment [Member] \| Home Equity and Second Mortgage [Member]
Individually evaluated for impairment					13	13
Collectively evaluated for impairment					727	670
Ending balance	740	791	740	826	740	683
Collectively evaluated for impairment					727	670
Beginning balance	680	791	683	626
Provision for loan losses	58	31	59	223
Charge-offs	0	0	(6)	(36)
Recoveries	2	4	4	13
Ending balance	740	826	740	826
Consumer Portfolio Segment [Member] \| Home Equity and Second Mortgage [Member] \| Receivables Acquired with Deteriorated Credit Quality [Member]
Ending balance	0		0		0	0
Beginning balance			0
Ending balance	0		0
Consumer Portfolio Segment [Member] \| Other Consumer Loan [Member]
Individually evaluated for impairment					0	6
Collectively evaluated for impairment					380	313
Ending balance	380	266	380	283	380	319
Collectively evaluated for impairment					380	313
Beginning balance	331	266	319	256
Provision for loan losses	167	96	486	268
Charge-offs	(157)	(106)	(547)	(325)
Recoveries	39	27	122	84
Ending balance	380	$ 283	380	$ 283
Consumer Portfolio Segment [Member] \| Other Consumer Loan [Member] \| Receivables Acquired with Deteriorated Credit Quality [Member]
Ending balance	0		0		$ 0	$ 0
Beginning balance			0
Ending balance	$ 0		$ 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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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

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-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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