Note 3 - Loans and Allowance for Loan Losses - Recorded Investments in Loans (Details) - USD ($) $ in Thousands	Jun. 30, 2019	Dec. 31, 2018
Principal loan balance	$ 463,409	$ 437,230
Accrued interest receivable	1,614	1,530
Net deferred loan origination fees and costs	1,128	1,095
Recorded investment in loans	466,151	439,855
Individually evaluated for impairment	3,376	3,785
Collectively evaluated for impairment	462,449	435,740
Financial Asset Acquired with Credit Deterioration [Member]
Recorded investment in loans	326	330
Real Estate Mortgage Portfolio Segment [Member] \| Real Estate Loan [Member]
Principal loan balance	140,035	136,445
Accrued interest receivable	488	475
Net deferred loan origination fees and costs	118	99
Recorded investment in loans	140,641	137,019
Individually evaluated for impairment	1,870	2,184
Collectively evaluated for impairment	138,488	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	22,584	22,607
Accrued interest receivable	97	119
Net deferred loan origination fees and costs	18	18
Recorded investment in loans	22,699	22,744
Individually evaluated for impairment	192	152
Collectively evaluated for impairment	22,507	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	32,792	25,375
Accrued interest receivable	108	76
Net deferred loan origination fees and costs	(7)	(9)
Recorded investment in loans	32,893	25,442
Individually evaluated for impairment		521
Collectively evaluated for impairment	32,893	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	111,862	107,445
Accrued interest receivable	264	265
Net deferred loan origination fees and costs	(44)	(38)
Recorded investment in loans	112,082	107,672
Individually evaluated for impairment	882	466
Collectively evaluated for impairment	111,157	107,158
Real Estate Mortgage Portfolio Segment [Member] \| Commercial Real Estate Loan [Member] \| Financial Asset Acquired with Credit Deterioration [Member]
Recorded investment in loans	43	48
Commercial Portfolio Segment [Member]
Principal loan balance	41,621	36,297
Accrued interest receivable	137	120
Net deferred loan origination fees and costs
Recorded investment in loans	41,758	36,417
Individually evaluated for impairment	400	427
Collectively evaluated for impairment	41,358	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	54,220	51,731
Accrued interest receivable	263	247
Net deferred loan origination fees and costs	1,043	1,025
Recorded investment in loans	55,526	53,003
Individually evaluated for impairment	28	35
Collectively evaluated for impairment	55,498	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	60,295	57,330
Accrued interest receivable	257	228
Net deferred loan origination fees and costs
Recorded investment in loans	60,552	57,558
Individually evaluated for impairment	4
Collectively evaluated for impairment	60,548	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

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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