Note 5 - Loans and Allowance for Loan Losses - Recorded Investment in Nonperforming Loans (Details) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Past due	$ 5,282	$ 8,079
Real Estate Mortgage Portfolio Segment [Member] \| Residential Loan [Member]
Past due	4,172
Real Estate Mortgage Portfolio Segment [Member] \| Land Loan [Member]
Past due	52	180
Real Estate Mortgage Portfolio Segment [Member] \| Construction Loans [Member]
Past due	0	71
Real Estate Mortgage Portfolio Segment [Member] \| Commercial Real Estate Loan [Member]
Past due	27	1,604
Commercial Portfolio Segment [Member]
Past due	238	167
Consumer Portfolio Segment [Member] \| Home Equity and Second Mortgage [Member]
Past due	365	451
Consumer Portfolio Segment [Member] \| Other Consumer Loan [Member]
Past due	428	486
Nonperforming Financial Instruments [Member]
Nonaccrual loans	2,946	4,222
Loans 90+ days past due still accruing	78	355
Past due	3,024	4,577
Nonperforming Financial Instruments [Member] \| Real Estate Mortgage Portfolio Segment [Member] \| Residential Loan [Member]
Nonaccrual loans	1,634	1,648
Loans 90+ days past due still accruing	55	271
Past due	1,689	1,919
Nonperforming Financial Instruments [Member] \| Real Estate Mortgage Portfolio Segment [Member] \| Land Loan [Member]
Nonaccrual loans	0	24
Loans 90+ days past due still accruing	0	75
Past due	0	99
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
Past due	0	0
Nonperforming Financial Instruments [Member] \| Real Estate Mortgage Portfolio Segment [Member] \| Commercial Real Estate Loan [Member]
Nonaccrual loans	924	2,267
Loans 90+ days past due still accruing	0	0
Past due	924	2,267
Nonperforming Financial Instruments [Member] \| Commercial Portfolio Segment [Member]
Nonaccrual loans	142	167
Loans 90+ days past due still accruing	0	0
Past due	142	167
Nonperforming Financial Instruments [Member] \| Consumer Portfolio Segment [Member] \| Home Equity and Second Mortgage [Member]
Nonaccrual loans	226	116
Loans 90+ days past due still accruing	0	0
Past due	226	116
Nonperforming Financial Instruments [Member] \| Consumer Portfolio Segment [Member] \| Other Consumer Loan [Member]
Nonaccrual loans	20	0
Loans 90+ days past due still accruing	23	9
Past due	$ 43	$ 9

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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