Note 3 - Loans and Allowance for Loan Losses - Recorded Investments in Loans (Details) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
Principal loan balance	$ 453,014	$ 437,230
Accrued interest receivable	1,562	1,530
Net deferred loan origination fees and costs	1,106	1,095
Recorded investment in loans	455,682	439,855
Individually evaluated for impairment	3,947	3,785
Collectively evaluated for impairment	451,408	435,740
Financial Asset Acquired with Credit Deterioration [Member]
Recorded investment in loans	327	330
Real Estate Mortgage Portfolio Segment [Member] \| Real Estate Loan [Member]
Principal loan balance	141,511	136,445
Accrued interest receivable	495	475
Net deferred loan origination fees and costs	105	99
Recorded investment in loans	142,111	137,019
Individually evaluated for impairment	2,329	2,184
Collectively evaluated for impairment	139,500	134,553
Real Estate Mortgage Portfolio Segment [Member] \| Real Estate Loan [Member] \| Financial Asset Acquired with Credit Deterioration [Member]
Recorded investment in loans	282	282
Real Estate Mortgage Portfolio Segment [Member] \| Land Loan [Member]
Principal loan balance	22,148	22,607
Accrued interest receivable	113	119
Net deferred loan origination fees and costs	19	18
Recorded investment in loans	22,280	22,744
Individually evaluated for impairment	189	152
Collectively evaluated for impairment	22,091	22,592
Real Estate Mortgage Portfolio Segment [Member] \| Land Loan [Member] \| Financial Asset Acquired with Credit Deterioration [Member]
Recorded investment in loans
Real Estate Mortgage Portfolio Segment [Member] \| Construction Loans [Member]
Principal loan balance	31,073	25,375
Accrued interest receivable	102	76
Net deferred loan origination fees and costs	(9)	(9)
Recorded investment in loans	31,166	25,442
Individually evaluated for impairment	525	521
Collectively evaluated for impairment	30,641	24,921
Real Estate Mortgage Portfolio Segment [Member] \| Construction Loans [Member] \| Financial Asset Acquired with Credit Deterioration [Member]
Recorded investment in loans
Real Estate Mortgage Portfolio Segment [Member] \| Commercial Real Estate Loan [Member]
Principal loan balance	106,787	107,445
Accrued interest receivable	244	265
Net deferred loan origination fees and costs	(39)	(38)
Recorded investment in loans	106,992	107,672
Individually evaluated for impairment	457	466
Collectively evaluated for impairment	106,490	107,158
Real Estate Mortgage Portfolio Segment [Member] \| Commercial Real Estate Loan [Member] \| Financial Asset Acquired with Credit Deterioration [Member]
Recorded investment in loans	45	48
Commercial Portfolio Segment [Member]
Principal loan balance	40,053	36,297
Accrued interest receivable	123	120
Net deferred loan origination fees and costs
Recorded investment in loans	40,176	36,417
Individually evaluated for impairment	422	427
Collectively evaluated for impairment	39,754	35,990
Commercial Portfolio Segment [Member] \| Financial Asset Acquired with Credit Deterioration [Member]
Recorded investment in loans
Consumer Portfolio Segment [Member] \| Home Equity and Second Mortgage [Member]
Principal loan balance	53,467	51,731
Accrued interest receivable	266	247
Net deferred loan origination fees and costs	1,030	1,025
Recorded investment in loans	54,763	53,003
Individually evaluated for impairment	25	35
Collectively evaluated for impairment	54,738	52,968
Consumer Portfolio Segment [Member] \| Home Equity and Second Mortgage [Member] \| Financial Asset Acquired with Credit Deterioration [Member]
Recorded investment in loans
Consumer Portfolio Segment [Member] \| All Other Consumer Excluding Home Equity and Second Mortgage [Member]
Principal loan balance	57,975	57,330
Accrued interest receivable	219	228
Net deferred loan origination fees and costs
Recorded investment in loans	58,194	57,558
Individually evaluated for impairment
Collectively evaluated for impairment	58,194	57,558
Consumer Portfolio Segment [Member] \| All Other Consumer Excluding Home Equity and Second Mortgage [Member] \| Financial Asset Acquired with Credit Deterioration [Member]
Recorded investment in loans

Represents loans and leases receivable accrued interest.

No definition available.

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Data Type:	xbrli:monetaryItemType
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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://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 11B
-Subparagraph (h)
-URI http://asc.fasb.org/extlink&oid=118936363&loc=SL6953423-111524

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- Definition

The balance of financing receivables that were individually evaluated for impairment.

+ 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://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 45
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=118952595&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://fasb.org/us-gaap/role/ref/legacyRef
-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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