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Note 3 - Impaired Loans (Details) - USD ($)	Jun. 30, 2016	Dec. 31, 2015
Commercial Portfolio Segment [Member]
With no allowance recorded, recorded investment	$ 295,000
With no allowance recorded, unpaid principal balance	327,000	96,000
With allowance recorded, recorded investment	2,977,000
With allowance recorded, unpaid principal balance	2,977,000
Related allowance	1,018,000
Recorded investment	3,272,000
Unpaid principal balance	3,304,000	96,000
Commercial Real Estate Portfolio Segment [Member]
With no allowance recorded, recorded investment	6,526,000	7,745,000
With no allowance recorded, unpaid principal balance	7,031,000	8,259,000
With allowance recorded, recorded investment
With allowance recorded, unpaid principal balance
Related allowance
Recorded investment	6,526,000	7,745,000
Unpaid principal balance	7,031,000	8,259,000
Construction Portfolio Segment [Member]
With no allowance recorded, recorded investment
With no allowance recorded, unpaid principal balance	287,000	287,000
With allowance recorded, recorded investment
With allowance recorded, unpaid principal balance
Related allowance
Recorded investment
Unpaid principal balance	287,000	287,000
Residential Portfolio Segment [Member]
With no allowance recorded, recorded investment	4,515,000	4,556,000
With no allowance recorded, unpaid principal balance	5,518,000	5,559,000
With allowance recorded, recorded investment
With allowance recorded, unpaid principal balance
Related allowance
Recorded investment	4,515,000	4,556,000
Unpaid principal balance	5,518,000	5,559,000
Construction to Permanent Portfolio Segment [Member]
With no allowance recorded, recorded investment
With no allowance recorded, unpaid principal balance
Consumer Portfolio Segment [Member]
With no allowance recorded, recorded investment	544,000	547,000
With no allowance recorded, unpaid principal balance	629,000	633,000
With allowance recorded, recorded investment	2,000	3,000
With allowance recorded, unpaid principal balance	2,000	3,000
Related allowance	2,000	3,000
Recorded investment	546,000	550,000
Unpaid principal balance	631,000	636,000
With no allowance recorded, recorded investment	11,880,000	12,848,000
With no allowance recorded, unpaid principal balance	13,792,000	14,834,000
With allowance recorded, recorded investment	2,979,000	3,000
With allowance recorded, unpaid principal balance	2,979,000	3,000
Related allowance	1,020,000	3,000
Recorded investment	14,859,000	12,851,000
Unpaid principal balance	$ 16,771,000	$ 14,837,000

X

- Definition

Amount of investment of impaired financing receivables with related allowance for credit losses and without a related allowance for credit losses.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 14A
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=66008989&loc=SL6953550-111524

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Namespace Prefix:	us-gaap_
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Balance Type:	debit
Period Type:	instant

X

- Definition

Amount of allowance for credit losses related to recorded investment.

+ 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 15
-Subparagraph (a)(3)
-URI http://asc.fasb.org/extlink&oid=66008989&loc=d3e5212-111524

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X

- Definition

Amount of unpaid principal balance of impaired financing receivables with related allowance for credit losses and without related allowance for credit losses.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 15
-Subparagraph (a)(4)
-URI http://asc.fasb.org/extlink&oid=66008989&loc=d3e5212-111524

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X

- Definition

Amount of investment in impaired financing receivables for which there is no related allowance for credit losses.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 14A
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=66008989&loc=SL6953550-111524

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X

- Definition

Amount of unpaid principal balance of impaired financing receivables for which there is no related allowance for credit losses.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 15
-Subparagraph (a)(4)
-URI http://asc.fasb.org/extlink&oid=66008989&loc=d3e5212-111524

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X

- Definition

Amount of investment in impaired financing receivables for which there is a related allowance for credit losses.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 14A
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=66008989&loc=SL6953550-111524

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X

- Definition

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+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 15
-Subparagraph (a)(4)
-URI http://asc.fasb.org/extlink&oid=66008989&loc=d3e5212-111524

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