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Note 3 - Impaired Loans (Details) - USD ($)	Sep. 30, 2016	Dec. 31, 2015
Commercial Portfolio Segment [Member]
With no allowance recorded, recorded investment
With no allowance recorded, unpaid principal balance		96,000
With allowance recorded, recorded investment	3,158,000
With allowance recorded, unpaid principal balance	3,208,000
Related allowance	3,158,000
Recorded investment	3,158,000
Unpaid principal balance	3,208,000	96,000
Commercial Real Estate Portfolio Segment [Member]
With no allowance recorded, recorded investment	6,713,000	7,745,000
With no allowance recorded, unpaid principal balance	6,833,000	8,259,000
With allowance recorded, recorded investment
With allowance recorded, unpaid principal balance
Related allowance
Recorded investment	6,713,000	7,745,000
Unpaid principal balance	6,833,000	8,259,000
Construction Portfolio Segment [Member]
With no allowance recorded, recorded investment
With no allowance recorded, unpaid principal balance		287,000
With allowance recorded, recorded investment
With allowance recorded, unpaid principal balance
Related allowance
Recorded investment
Unpaid principal balance		287,000
Construction to Permanent Portfolio Segment [Member]
With no allowance recorded, recorded investment
With no allowance recorded, unpaid principal balance
With allowance recorded, recorded investment
With allowance recorded, unpaid principal balance
Related allowance
Recorded investment
Unpaid principal balance
Residential Portfolio Segment [Member]
With no allowance recorded, recorded investment	4,676,000	4,556,000
With no allowance recorded, unpaid principal balance	5,527,000	5,559,000
With allowance recorded, recorded investment
With allowance recorded, unpaid principal balance
Related allowance
Recorded investment	4,676,000	4,556,000
Unpaid principal balance	5,527,000	5,559,000
Consumer Portfolio Segment [Member]
With no allowance recorded, recorded investment		547,000
With no allowance recorded, unpaid principal balance		633,000
With allowance recorded, recorded investment	3,000	3,000
With allowance recorded, unpaid principal balance	3,000	3,000
Related allowance	3,000	3,000
Recorded investment	3,000	550,000
Unpaid principal balance	3,000	636,000
With no allowance recorded, recorded investment	11,389,000	12,848,000
With no allowance recorded, unpaid principal balance	12,360,000	14,834,000
With allowance recorded, recorded investment	3,161,000	3,000
With allowance recorded, unpaid principal balance	3,211,000	3,000
Related allowance	3,161,000	3,000
Recorded investment	14,550,000	12,851,000
Unpaid principal balance	$ 15,571,000	$ 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

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
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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Namespace Prefix:	us-gaap_
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Period Type:	instant

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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Period Type:	instant

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

Unpaid principal balance of 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 15
-Subparagraph (a)(4)
-URI http://asc.fasb.org/extlink&oid=66008989&loc=d3e5212-111524

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X

- Details

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Data Type:	na
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X

- Details

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Data Type:	na
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