Note 4 - Loans and Allowance for Loan Losses - Recorded Investment in Nonperforming Loans (Details) - USD ($)	Sep. 30, 2016	Dec. 31, 2015
Nonperforming Financial Instruments [Member] \| Real Estate Mortgage Portfolio Segment [Member] \| Residential Loan [Member]
Nonaccrual Loans	$ 1,584,000	$ 1,648,000
Loans 90+ Days Past Due Still Accruing	27,000	271,000
Total Nonperforming Loans	1,611,000	1,919,000
Nonperforming Financial Instruments [Member] \| Real Estate Mortgage Portfolio Segment [Member] \| Land Loan [Member]
Nonaccrual Loans	0	24,000
Loans 90+ Days Past Due Still Accruing	0	75,000
Total Nonperforming Loans	0	99,000
Nonperforming Financial Instruments [Member] \| Real Estate Mortgage Portfolio Segment [Member] \| Construction Loans [Member]
Nonaccrual Loans	0	0
Loans 90+ Days Past Due Still Accruing	177,000	0
Total Nonperforming Loans	177,000	0
Nonperforming Financial Instruments [Member] \| Real Estate Mortgage Portfolio Segment [Member] \| Commercial Real Estate Loan [Member]
Nonaccrual Loans	1,658,000	2,267,000
Loans 90+ Days Past Due Still Accruing	0	0
Total Nonperforming Loans	1,658,000	2,267,000
Nonperforming Financial Instruments [Member] \| Commercial Portfolio Segment [Member]
Nonaccrual Loans	61,000	167,000
Loans 90+ Days Past Due Still Accruing	0	0
Total Nonperforming Loans	61,000	167,000
Nonperforming Financial Instruments [Member] \| Consumer Portfolio Segment [Member] \| Home Equity and Second Mortgage [Member]
Nonaccrual Loans	44,000	116,000
Loans 90+ Days Past Due Still Accruing	0	0
Total Nonperforming Loans	44,000	116,000
Nonperforming Financial Instruments [Member] \| Consumer Portfolio Segment [Member] \| Other Consumer Loan [Member]
Nonaccrual Loans	30,000	0
Loans 90+ Days Past Due Still Accruing	0	9,000
Total Nonperforming Loans	30,000	9,000
Nonperforming Financial Instruments [Member]
Nonaccrual Loans	3,377,000	4,222,000
Loans 90+ Days Past Due Still Accruing	204,000	355,000
Total Nonperforming Loans	3,581,000	4,577,000
Real Estate Mortgage Portfolio Segment [Member] \| Residential Loan [Member]
Total Nonperforming Loans	3,732,000	5,120,000
Real Estate Mortgage Portfolio Segment [Member] \| Land Loan [Member]
Total Nonperforming Loans	152,000	180,000
Real Estate Mortgage Portfolio Segment [Member] \| Construction Loans [Member]
Total Nonperforming Loans	177,000	71,000
Real Estate Mortgage Portfolio Segment [Member] \| Commercial Real Estate Loan [Member]
Total Nonperforming Loans	742,000	1,604,000
Commercial Portfolio Segment [Member]
Total Nonperforming Loans	176,000	167,000
Consumer Portfolio Segment [Member] \| Home Equity and Second Mortgage [Member]
Total Nonperforming Loans	382,000	451,000
Consumer Portfolio Segment [Member] \| Other Consumer Loan [Member]
Total Nonperforming Loans	380,000	486,000
Total Nonperforming Loans	$ 5,741,000	$ 8,079,000

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
-Glossary Recorded Investment
-URI http://asc.fasb.org/extlink&oid=65880944

Reference 2: 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=66008989&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

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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
-Glossary Recorded Investment
-URI http://asc.fasb.org/extlink&oid=65880944

Reference 2: 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=66008989&loc=SL6953401-111524

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