Note 3 - Loans and Allowance for Loan Losses - Recorded Investments in Loans (Details) - USD ($) $ in Thousands	Mar. 31, 2020	Dec. 31, 2019
Principal loan balance	$ 469,478	$ 470,418
Accrued interest receivable	1,526	1,632
Net deferred loan origination fees and costs	1,121	1,137
Recorded investment in loans	472,125	473,187
Individually evaluated for impairment	2,747	2,747
Collectively evaluated for impairment	469,060	470,116
Financial Asset Acquired with Credit Deterioration [Member]
Recorded investment in loans	318	324
Real Estate Mortgage Portfolio Segment [Member] \| Real Estate Loan [Member]
Principal loan balance	128,039	131,959
Accrued interest receivable	453	462
Net deferred loan origination fees and costs	116	118
Recorded investment in loans	128,608	132,539
Individually evaluated for impairment	1,840	1,926
Collectively evaluated for impairment	126,487	130,328
Real Estate Mortgage Portfolio Segment [Member] \| Real Estate Loan [Member] \| Financial Asset Acquired with Credit Deterioration [Member]
Recorded investment in loans	281	285
Real Estate Mortgage Portfolio Segment [Member] \| Land Loan [Member]
Principal loan balance	18,861	19,185
Accrued interest receivable	98	114
Net deferred loan origination fees and costs	14	15
Recorded investment in loans	18,973	19,314
Individually evaluated for impairment	115	115
Collectively evaluated for impairment	18,858	19,199
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	30,742	32,559
Accrued interest receivable	70	86
Net deferred loan origination fees and costs	(6)	(1)
Recorded investment in loans	30,806	32,644
Individually evaluated for impairment
Collectively evaluated for impairment	30,806	32,644
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	129,180	121,563
Accrued interest receivable	344	312
Net deferred loan origination fees and costs	(68)	(62)
Recorded investment in loans	129,456	121,813
Individually evaluated for impairment	447	353
Collectively evaluated for impairment	128,972	121,421
Real Estate Mortgage Portfolio Segment [Member] \| Commercial Real Estate Loan [Member] \| Financial Asset Acquired with Credit Deterioration [Member]
Recorded investment in loans	37	39
Commercial Portfolio Segment [Member]
Principal loan balance	44,811	45,307
Accrued interest receivable	117	142
Net deferred loan origination fees and costs
Recorded investment in loans	44,928	45,449
Individually evaluated for impairment	247	249
Collectively evaluated for impairment	44,681	45,200
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	54,655	54,677
Accrued interest receivable	218	244
Net deferred loan origination fees and costs	1,065	1,067
Recorded investment in loans	55,938	55,988
Individually evaluated for impairment	56	56
Collectively evaluated for impairment	55,882	55,932
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	63,190	65,168
Accrued interest receivable	226	272
Net deferred loan origination fees and costs
Recorded investment in loans	63,416	65,440
Individually evaluated for impairment	42	48
Collectively evaluated for impairment	63,374	65,392
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=121611835&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=121593590&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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