Note 3 - Loans and Allowance for Loan Losses - Recorded Investments in Loans (Details) - USD ($) $ in Thousands	Mar. 31, 2017	Dec. 31, 2016
Principal loan balance	$ 387,607	$ 383,703
Accrued interest receivable	1,150	1,224
Net deferred loan origination fees and costs	895	837
Recorded investment in loans	389,652	385,764
Individually evaluated for impairment	3,710	3,707
Collectively evaluated for impairment	385,346	381,427
Receivables Acquired with Deteriorated Credit Quality [Member]
Recorded investment in loans	596	630
Real Estate Mortgage Portfolio Segment [Member] \| Real Estate Loan [Member]
Principal loan balance	136,714	137,842
Accrued interest receivable	437	455
Net deferred loan origination fees and costs	83	80
Recorded investment in loans	137,234	138,377
Individually evaluated for impairment	2,236	2,083
Collectively evaluated for impairment	134,604	135,904
Real Estate Mortgage Portfolio Segment [Member] \| Real Estate Loan [Member] \| Receivables Acquired with Deteriorated Credit Quality [Member]
Recorded investment in loans	394	390
Real Estate Mortgage Portfolio Segment [Member] \| Land Loan [Member]
Principal loan balance	16,252	13,895
Accrued interest receivable	37	42
Net deferred loan origination fees and costs	16	14
Recorded investment in loans	16,305	13,951
Individually evaluated for impairment	0	0
Collectively evaluated for impairment	16,305	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	22,646	19,445
Accrued interest receivable	56	44
Net deferred loan origination fees and costs	1	0
Recorded investment in loans	22,703	19,489
Individually evaluated for impairment	0	0
Collectively evaluated for impairment	22,703	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	92,825	96,462
Accrued interest receivable	230	249
Net deferred loan origination fees and costs	(33)	(42)
Recorded investment in loans	93,022	96,669
Individually evaluated for impairment	1,082	1,217
Collectively evaluated for impairment	91,738	95,212
Real Estate Mortgage Portfolio Segment [Member] \| Commercial Real Estate Loan [Member] \| Receivables Acquired with Deteriorated Credit Quality [Member]
Recorded investment in loans	202	240
Commercial Portfolio Segment [Member]
Principal loan balance	26,097	24,056
Accrued interest receivable	69	67
Net deferred loan origination fees and costs	3	3
Recorded investment in loans	26,169	24,126
Individually evaluated for impairment	123	143
Collectively evaluated for impairment	26,046	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	44,456	42,908
Accrued interest receivable	137	141
Net deferred loan origination fees and costs	825	782
Recorded investment in loans	45,418	43,831
Individually evaluated for impairment	242	244
Collectively evaluated for impairment	45,176	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	48,617	49,095
Accrued interest receivable	184	226
Net deferred loan origination fees and costs	0	0
Recorded investment in loans	48,801	49,321
Individually evaluated for impairment	27	20
Collectively evaluated for impairment	48,774	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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