Note 3 - Loans and Allowance for Loan Losses - Recorded Investment in Nonperforming Loans (Details) - USD ($) $ in Thousands	Sep. 30, 2017	Dec. 31, 2016
Total Nonperforming Loans	$ 5,503	$ 5,282
Real Estate Mortgage Portfolio Segment [Member] \| Residential Loan [Member]
Total Nonperforming Loans	3,989	4,172
Real Estate Mortgage Portfolio Segment [Member] \| Land Loan [Member]
Total Nonperforming Loans	152	52
Real Estate Mortgage Portfolio Segment [Member] \| Construction Loans [Member]
Total Nonperforming Loans	0	0
Real Estate Mortgage Portfolio Segment [Member] \| Commercial Real Estate Loan [Member]
Total Nonperforming Loans	33	27
Commercial Portfolio Segment [Member]
Total Nonperforming Loans	716	238
Consumer Portfolio Segment [Member] \| Home Equity and Second Mortgage [Member]
Total Nonperforming Loans	297	365
Consumer Portfolio Segment [Member] \| Other Consumer Loan [Member]
Total Nonperforming Loans	316	428
Nonperforming Financial Instruments [Member]
Nonaccrual Loans	2,665	2,946
Loans 90+ Days Past Due Still Accruing	13	78
Total Nonperforming Loans	2,678	3,024
Nonperforming Financial Instruments [Member] \| Real Estate Mortgage Portfolio Segment [Member] \| Residential Loan [Member]
Nonaccrual Loans	2,338	1,634
Loans 90+ Days Past Due Still Accruing	13	55
Total Nonperforming Loans	2,351	1,689
Nonperforming Financial Instruments [Member] \| Real Estate Mortgage Portfolio Segment [Member] \| Land Loan [Member]
Nonaccrual Loans	0	0
Loans 90+ Days Past Due Still Accruing	0	0
Total Nonperforming Loans	0	0
Nonperforming Financial Instruments [Member] \| Real Estate Mortgage Portfolio Segment [Member] \| Construction Loans [Member]
Nonaccrual Loans	0	0
Loans 90+ Days Past Due Still Accruing	0	0
Total Nonperforming Loans	0	0
Nonperforming Financial Instruments [Member] \| Real Estate Mortgage Portfolio Segment [Member] \| Commercial Real Estate Loan [Member]
Nonaccrual Loans	33	924
Loans 90+ Days Past Due Still Accruing	0	0
Total Nonperforming Loans	33	924
Nonperforming Financial Instruments [Member] \| Commercial Portfolio Segment [Member]
Nonaccrual Loans	55	142
Loans 90+ Days Past Due Still Accruing	0	0
Total Nonperforming Loans	55	142
Nonperforming Financial Instruments [Member] \| Consumer Portfolio Segment [Member] \| Home Equity and Second Mortgage [Member]
Nonaccrual Loans	239	226
Loans 90+ Days Past Due Still Accruing	0	0
Total Nonperforming Loans	239	226
Nonperforming Financial Instruments [Member] \| Consumer Portfolio Segment [Member] \| Other Consumer Loan [Member]
Nonaccrual Loans	0	20
Loans 90+ Days Past Due Still Accruing	0	23
Total Nonperforming Loans	$ 0	$ 43

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

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-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://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 7
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=84173941&loc=d3e5111-111524

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- Definition

Recorded Investment in financing receivables that are past due at the balance sheet date.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 7A
-URI http://asc.fasb.org/extlink&oid=84173941&loc=SL6953401-111524

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