Note 3 - Loans and Allowance for Loan Losses - Recorded Investments in Loans (Details) - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019
Principal loan balance	$ 498,665	$ 470,418
Accrued interest receivable	1,959	1,632
Deferred loan origination fees and costs, net	(133)	1,137
Recorded investment in loans	500,491	473,187
Individually evaluated for impairment	3,760	2,747
Collectively evaluated for impairment	496,422	470,116
Financial Asset Acquired with Credit Deterioration [Member]
Recorded investment in loans	309	324
Real Estate Mortgage Portfolio Segment [Member] \| Real Estate Loan [Member]
Principal loan balance	127,146	131,959
Accrued interest receivable	499	462
Deferred loan origination fees and costs, net	116	118
Recorded investment in loans	127,761	132,539
Individually evaluated for impairment	1,591	1,926
Collectively evaluated for impairment	125,892	130,328
Real Estate Mortgage Portfolio Segment [Member] \| Real Estate Loan [Member] \| Financial Asset Acquired with Credit Deterioration [Member]
Recorded investment in loans	278	285
Real Estate Mortgage Portfolio Segment [Member] \| Land Loan [Member]
Principal loan balance	17,181	19,185
Accrued interest receivable	123	114
Deferred loan origination fees and costs, net	14	15
Recorded investment in loans	17,318	19,314
Individually evaluated for impairment	97	115
Collectively evaluated for impairment	17,221	19,199
Real Estate Mortgage Portfolio Segment [Member] \| Land Loan [Member] \| Financial Asset Acquired with Credit Deterioration [Member]
Recorded investment in loans	0	0
Real Estate Mortgage Portfolio Segment [Member] \| Construction Loans [Member]
Principal loan balance	29,693	32,559
Accrued interest receivable	66	86
Deferred loan origination fees and costs, net	(9)	(1)
Recorded investment in loans	29,750	32,644
Individually evaluated for impairment	0	0
Collectively evaluated for impairment	29,750	32,644
Real Estate Mortgage Portfolio Segment [Member] \| Construction Loans [Member] \| Financial Asset Acquired with Credit Deterioration [Member]
Recorded investment in loans	0	0
Real Estate Mortgage Portfolio Segment [Member] \| Commercial Real Estate Loan [Member]
Principal loan balance	128,130	121,563
Accrued interest receivable	560	312
Deferred loan origination fees and costs, net	(64)	(62)
Recorded investment in loans	128,626	121,813
Individually evaluated for impairment	1,284	353
Collectively evaluated for impairment	127,311	121,421
Real Estate Mortgage Portfolio Segment [Member] \| Commercial Real Estate Loan [Member] \| Financial Asset Acquired with Credit Deterioration [Member]
Recorded investment in loans	31	39
Commercial Portfolio Segment [Member]
Principal loan balance	79,856	45,307
Accrued interest receivable	294	142
Deferred loan origination fees and costs, net	(1,275)	0
Recorded investment in loans	78,875	45,449
Individually evaluated for impairment	436	249
Collectively evaluated for impairment	78,439	45,200
Commercial Portfolio Segment [Member] \| Financial Asset Acquired with Credit Deterioration [Member]
Recorded investment in loans	0	0
Consumer Portfolio Segment [Member] \| Home Equity and Second Mortgage [Member]
Principal loan balance	51,885	54,677
Accrued interest receivable	166	244
Deferred loan origination fees and costs, net	1,085	1,067
Recorded investment in loans	53,136	55,988
Individually evaluated for impairment	352	56
Collectively evaluated for impairment	52,784	55,932
Consumer Portfolio Segment [Member] \| Home Equity and Second Mortgage [Member] \| Financial Asset Acquired with Credit Deterioration [Member]
Recorded investment in loans	0	0
Consumer Portfolio Segment [Member] \| All Other Consumer Excluding Home Equity and Second Mortgage [Member]
Principal loan balance	64,774	65,168
Accrued interest receivable	251	272
Deferred loan origination fees and costs, net	0	0
Recorded investment in loans	65,025	65,440
Individually evaluated for impairment	0	48
Collectively evaluated for impairment	65,025	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	$ 0	$ 0

Represents loans and leases receivable accrued interest.

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- Definition

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+ References

No definition available.

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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
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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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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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