Note 3 - Loans and Allowance for Loan Losses - Recorded Investments in Loans (Details) - USD ($) $ in Thousands	Sep. 30, 2019	Dec. 31, 2018
Principal loan balance	$ 471,314	$ 437,230
Accrued interest receivable	1,551	1,530
Net deferred loan origination fees and costs	1,119	1,095
Recorded investment in loans	473,984	439,855
Individually evaluated for impairment	3,107	3,785
Collectively evaluated for impairment	470,552	435,740
Financial Asset Acquired with Credit Deterioration [Member]
Recorded investment in loans	325	330
Real Estate Mortgage Portfolio Segment [Member] \| Real Estate Loan [Member]
Principal loan balance	142,801	136,445
Accrued interest receivable	468	475
Net deferred loan origination fees and costs	116	99
Recorded investment in loans	143,385	137,019
Individually evaluated for impairment	1,988	2,184
Collectively evaluated for impairment	141,114	134,553
Real Estate Mortgage Portfolio Segment [Member] \| Real Estate Loan [Member] \| Financial Asset Acquired with Credit Deterioration [Member]
Recorded investment in loans	283	282
Real Estate Mortgage Portfolio Segment [Member] \| Land Loan [Member]
Principal loan balance	21,929	22,607
Accrued interest receivable	112	119
Net deferred loan origination fees and costs	16	18
Recorded investment in loans	22,057	22,744
Individually evaluated for impairment	89	152
Collectively evaluated for impairment	21,968	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	35,643	25,375
Accrued interest receivable	104	76
Net deferred loan origination fees and costs	(7)	(9)
Recorded investment in loans	35,740	25,442
Individually evaluated for impairment		521
Collectively evaluated for impairment	35,740	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	116,584	107,445
Accrued interest receivable	264	265
Net deferred loan origination fees and costs	(58)	(38)
Recorded investment in loans	116,790	107,672
Individually evaluated for impairment	689	466
Collectively evaluated for impairment	116,059	107,158
Real Estate Mortgage Portfolio Segment [Member] \| Commercial Real Estate Loan [Member] \| Financial Asset Acquired with Credit Deterioration [Member]
Recorded investment in loans	42	48
Commercial Portfolio Segment [Member]
Principal loan balance	38,620	36,297
Accrued interest receivable	104	120
Net deferred loan origination fees and costs
Recorded investment in loans	38,724	36,417
Individually evaluated for impairment	255	427
Collectively evaluated for impairment	38,469	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	52,387	51,731
Accrued interest receivable	244	247
Net deferred loan origination fees and costs	1,052	1,025
Recorded investment in loans	53,683	53,003
Individually evaluated for impairment	37	35
Collectively evaluated for impairment	53,646	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	63,350	57,330
Accrued interest receivable	255	228
Net deferred loan origination fees and costs
Recorded investment in loans	63,605	57,558
Individually evaluated for impairment	49
Collectively evaluated for impairment	63,556	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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- 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

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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://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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