Note 3 - Loans and Allowance for Loan Losses - Recorded Investments in Loans (Details) - USD ($) $ in Thousands	Sep. 30, 2017	Dec. 31, 2016
Principal loan balance	$ 403,276	$ 383,703
Accrued interest receivable	1,262	1,224
Net deferred loan origination fees and costs	1,023	837
Recorded investment in loans	405,561	385,764
Individually evaluated for impairment	3,558	3,707
Collectively evaluated for impairment	401,567	381,427
Receivables Acquired with Deteriorated Credit Quality [Member]
Recorded investment in loans	436	630
Real Estate Mortgage Portfolio Segment [Member] \| Residential Loan [Member]
Principal loan balance	136,273	137,842
Accrued interest receivable	454	455
Net deferred loan origination fees and costs	86	80
Recorded investment in loans	136,813	138,377
Individually evaluated for impairment	2,950	2,083
Collectively evaluated for impairment	133,480	135,904
Real Estate Mortgage Portfolio Segment [Member] \| Residential Loan [Member] \| Receivables Acquired with Deteriorated Credit Quality [Member]
Recorded investment in loans	383	390
Real Estate Mortgage Portfolio Segment [Member] \| Land Loan [Member]
Principal loan balance	17,638	13,895
Accrued interest receivable	83	42
Net deferred loan origination fees and costs	16	14
Recorded investment in loans	17,737	13,951
Individually evaluated for impairment	0	0
Collectively evaluated for impairment	17,737	13,951
Real Estate Mortgage Portfolio Segment [Member] \| Land Loan [Member] \| Receivables Acquired with Deteriorated Credit Quality [Member]
Recorded investment in loans	0	0
Real Estate Mortgage Portfolio Segment [Member] \| Construction Loans [Member]
Principal loan balance	22,974	19,445
Accrued interest receivable	48	44
Net deferred loan origination fees and costs	(3)	0
Recorded investment in loans	23,019	19,489
Individually evaluated for impairment	0	0
Collectively evaluated for impairment	23,019	19,489
Real Estate Mortgage Portfolio Segment [Member] \| Construction Loans [Member] \| Receivables Acquired with Deteriorated Credit Quality [Member]
Recorded investment in loans	0	0
Real Estate Mortgage Portfolio Segment [Member] \| Commercial Real Estate Loan [Member]
Principal loan balance	95,339	96,462
Accrued interest receivable	206	249
Net deferred loan origination fees and costs	(33)	(42)
Recorded investment in loans	95,512	96,669
Individually evaluated for impairment	297	1,217
Collectively evaluated for impairment	95,162	95,212
Real Estate Mortgage Portfolio Segment [Member] \| Commercial Real Estate Loan [Member] \| Receivables Acquired with Deteriorated Credit Quality [Member]
Recorded investment in loans	53	240
Commercial Portfolio Segment [Member]
Principal loan balance	28,525	24,056
Accrued interest receivable	70	67
Net deferred loan origination fees and costs	3	3
Recorded investment in loans	28,598	24,126
Individually evaluated for impairment	55	143
Collectively evaluated for impairment	28,543	23,983
Commercial Portfolio Segment [Member] \| Receivables Acquired with Deteriorated Credit Quality [Member]
Recorded investment in loans	0	0
Consumer Portfolio Segment [Member] \| Home Equity and Second Mortgage [Member]
Principal loan balance	48,951	42,908
Accrued interest receivable	174	141
Net deferred loan origination fees and costs	954	782
Recorded investment in loans	50,079	43,831
Individually evaluated for impairment	256	244
Collectively evaluated for impairment	49,823	43,587
Consumer Portfolio Segment [Member] \| Home Equity and Second Mortgage [Member] \| Receivables Acquired with Deteriorated Credit Quality [Member]
Recorded investment in loans	0	0
Consumer Portfolio Segment [Member] \| Other Consumer Loan [Member]
Principal loan balance	53,576	49,095
Accrued interest receivable	227	226
Net deferred loan origination fees and costs	0	0
Recorded investment in loans	53,803	49,321
Individually evaluated for impairment	0	20
Collectively evaluated for impairment	53,803	49,301
Consumer Portfolio Segment [Member] \| Other Consumer Loan [Member] \| Receivables Acquired with Deteriorated Credit Quality [Member]
Recorded investment in loans	$ 0	$ 0

Represents loans and leases receivable accrued interest.

No definition available.

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- Definition

Represents the loans and leases receivable principal balance.

+ References

No definition available.

+ Details

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- Definition

The balance of financing receivables 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 (h)
-URI http://asc.fasb.org/extlink&oid=84173941&loc=SL6953423-111524

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- Definition

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+ References

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- Definition

Amount before allowance of loans and leases held in portfolio, including but not limited to, commercial and consumer loans. Includes deferred interest and fees, undisbursed portion of loan balance, unamortized costs and premiums and discounts from face amounts. Excludes loans and leases covered under loss sharing agreements.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 45
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=82891408&loc=d3e4428-111522

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- Definition

Amount of deferred fees paid by borrowers and unamortized costs incurred to originate loans and leases, unamortized loan commitments and loan syndication fees, and premiums over or discounts from face amounts of loans that are being amortized into income as an adjustment to yield. Excludes amounts for loans and leases covered under loss sharing agreements.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 20
-Section 45
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=6378536&loc=d3e10092-111533

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