Note 3 - Loans and Allowance for Loan Losses - Recorded Investment in Nonperforming Loans (Details) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Total Nonperforming Loans	$ 5,271	$ 6,194
Real Estate Mortgage Portfolio Segment [Member] \| Residential Loan [Member]
Total Nonperforming Loans	3,736	4,205
Real Estate Mortgage Portfolio Segment [Member] \| Land Loan [Member]
Total Nonperforming Loans	475	281
Real Estate Mortgage Portfolio Segment [Member] \| Construction Loans [Member]
Total Nonperforming Loans
Real Estate Mortgage Portfolio Segment [Member] \| Commercial Real Estate Loan [Member]
Total Nonperforming Loans	337	518
Commercial Portfolio Segment [Member]
Total Nonperforming Loans	280	197
Consumer Portfolio Segment [Member] \| Home Equity and Second Mortgage [Member]
Total Nonperforming Loans	166	508
Consumer Portfolio Segment [Member] \| Other Consumer Loan [Member]
Total Nonperforming Loans	277	485
Nonperforming Financial Instruments [Member]
Nonaccrual Loans	2,675	2,536
Loans 90+ Days Past Due Still Accruing	179	291
Total Nonperforming Loans	2,854	2,827
Nonperforming Financial Instruments [Member] \| Real Estate Mortgage Portfolio Segment [Member] \| Residential Loan [Member]
Nonaccrual Loans	2,262	2,298
Loans 90+ Days Past Due Still Accruing	100	109
Total Nonperforming Loans	2,362	2,407
Nonperforming Financial Instruments [Member] \| Real Estate Mortgage Portfolio Segment [Member] \| Land Loan [Member]
Nonaccrual Loans	94
Loans 90+ Days Past Due Still Accruing		95
Total Nonperforming Loans	94	95
Nonperforming Financial Instruments [Member] \| Real Estate Mortgage Portfolio Segment [Member] \| Construction Loans [Member]
Nonaccrual Loans
Loans 90+ Days Past Due Still Accruing
Total Nonperforming Loans
Nonperforming Financial Instruments [Member] \| Real Estate Mortgage Portfolio Segment [Member] \| Commercial Real Estate Loan [Member]
Nonaccrual Loans	104	139
Loans 90+ Days Past Due Still Accruing
Total Nonperforming Loans	104	139
Nonperforming Financial Instruments [Member] \| Commercial Portfolio Segment [Member]
Nonaccrual Loans	139	42
Loans 90+ Days Past Due Still Accruing	66	59
Total Nonperforming Loans	205	101
Nonperforming Financial Instruments [Member] \| Consumer Portfolio Segment [Member] \| Home Equity and Second Mortgage [Member]
Nonaccrual Loans	76	57
Loans 90+ Days Past Due Still Accruing
Total Nonperforming Loans	76	57
Nonperforming Financial Instruments [Member] \| Consumer Portfolio Segment [Member] \| Other Consumer Loan [Member]
Nonaccrual Loans
Loans 90+ Days Past Due Still Accruing	13	28
Total Nonperforming Loans	$ 13	$ 28

Recorded investment in financing receivables that are 90 days or more past due and still accruing.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 7
-Subparagraph (d)
-URI http://asc.fasb.org/extlink&oid=84173941&loc=d3e5111-111524

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- Definition

Recorded investment in financing receivables that are on nonaccrual status as of the balance sheet date.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 7
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-URI http://asc.fasb.org/extlink&oid=84173941&loc=d3e5111-111524

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- Definition

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+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
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-Paragraph 7A
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