Note 5 - Loans and Allowance for Loan Losses - Loans (Details) - USD ($)	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Loans	$ 437,231,000	$ 402,740,000
Less undisbursed portion of loans in process	(25,020,000)	(19,037,000)
Principal loan balance	412,211,000	383,703,000
Deferred loan origination fees and costs, net	1,041,000	837,000
Allowance for loan losses	(3,634,000)	(3,386,000)	$ (3,415,000)	$ (4,846,000)
Loans, net	409,618,000	381,154,000
Real Estate Mortgage Portfolio Segment [Member] \| Residential Loan [Member]
Loans	136,399,000	137,842,000
Allowance for loan losses	(219,000)	(380,000)	(527,000)	(609,000)
Real Estate Mortgage Portfolio Segment [Member] \| Land Loan [Member]
Loans	18,198,000	13,895,000
Principal loan balance	18,198,000	13,895,000
Deferred loan origination fees and costs, net	17,000	14,000
Allowance for loan losses	(133,000)	(56,000)	(157,000)	(201,000)
Real Estate Mortgage Portfolio Segment [Member] \| Construction Loans [Member]
Loans	28,854,000	29,561,000
Principal loan balance	20,995,000	19,445,000
Deferred loan origination fees and costs, net	(10,000)
Allowance for loan losses	(245,000)	(80,000)	(47,000)	(60,000)
Real Estate Mortgage Portfolio Segment [Member] \| Commercial Real Estate Loan [Member]
Loans	100,133,000	96,462,000
Principal loan balance	100,133,000	96,462,000
Deferred loan origination fees and costs, net	(42,000)	(42,000)
Allowance for loan losses	(1,622,000)	(1,670,000)	(1,541,000)	(1,501,000)
Real Estate Mortgage Portfolio Segment [Member] \| Commercial Real Estate Construction [Member]
Loans	17,161	8,921
Commercial Portfolio Segment [Member]
Loans	34,114,000	24,056,000
Principal loan balance	34,114,000	24,056,000
Deferred loan origination fees and costs, net	2,000	3,000
Allowance for loan losses	(291,000)	(198,000)	(261,000)	(1,480,000)
Consumer Portfolio Segment [Member] \| Home Equity and Second Mortgage [Member]
Loans	49,802,000	42,908,000
Principal loan balance	49,802,000	42,908,000
Deferred loan origination fees and costs, net	987,000	782,000
Allowance for loan losses	(710,000)	(683,000)	(626,000)	(720,000)
Consumer Portfolio Segment [Member] \| Automobile Loan [Member]
Loans	38,361,000	34,279,000
Consumer Portfolio Segment [Member] \| Loans Secured by Deposits [Member]
Loans	1,751,000	1,879,000
Consumer Portfolio Segment [Member] \| Unsecured Loan [Member]
Loans	3,744,000	3,912,000
Consumer Portfolio Segment [Member] \| Other Consumer Loan [Member]
Loans	8,714,000	9,025,000
Principal loan balance	52,570,000	49,095,000
Deferred loan origination fees and costs, net
Allowance for loan losses	$ (414,000)	$ (319,000)	$ (256,000)	$ (275,000)

Represents the loans and leases receivable principal balance.

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A valuation allowance for financing receivables that are expected to be uncollectible.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 11B
-Subparagraph (c)(1)
-URI http://asc.fasb.org/extlink&oid=84173941&loc=SL6953423-111524

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Amount of undisbursed portion of the loan receivable balance (loans in process). Excludes loans and leases covered under loss sharing agreements.

+ References

No definition available.

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Amount before allowance and after deduction of deferred interest and fees, unamortized costs and premiums and discounts from face amounts, of loans and leases held in portfolio, including but not limited to, commercial and consumer loans. Excludes loans and leases covered under loss sharing agreements.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 45
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=82891408&loc=d3e4428-111522

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 4
-URI http://asc.fasb.org/extlink&oid=84173941&loc=d3e5074-111524

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Amount after allowance and deduction of deferred interest and fees, unamortized costs and premiums and discounts from face amounts, of loans and leases held in portfolio, including but not limited to, commercial and consumer loans. Excludes loans and leases covered under loss sharing agreements and loans held for sale.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 45
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=82891408&loc=d3e4428-111522

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03.7)
-URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878

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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://www.xbrl.org/2003/role/presentationRef
-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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