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Note 3 - Loan Receivables and Allowance for Loan Losses - Impaired Loans (Details) - USD ($)	Mar. 31, 2017	Dec. 31, 2016
Impaired loans with no related allowance recorded, recorded investment	$ 8,653,000	$ 8,720,000
Impaired loans with no related allowance recorded, unpaid principal balance	9,514,000	10,267,000
Impaired loans with a related allowance recorded, recorded investment	232,000	231,000
Impaired loans with a related allowance recorded, unpaid principal balance	232,000	231,000
Impaired loans, related allowance	232,000	231,000
Impaired loans, recorded investment	8,885,000	8,951,000
Impaired loans, unpaid principal balance	9,746,000	10,498,000
Commercial Real Estate Portfolio Segment [Member]
Impaired loans with no related allowance recorded, recorded investment	6,204,000	6,267,000
Impaired loans with no related allowance recorded, unpaid principal balance	6,656,000	6,721,000
Impaired loans with a related allowance recorded, recorded investment
Impaired loans with a related allowance recorded, unpaid principal balance
Impaired loans, related allowance
Impaired loans, recorded investment	6,204,000	6,267,000
Impaired loans, unpaid principal balance	6,656,000	6,721,000
Residential Portfolio Segment [Member]
Impaired loans with no related allowance recorded, recorded investment	1,908,000	1,911,000
Impaired loans with no related allowance recorded, unpaid principal balance	1,941,000	2,915,000
Impaired loans with a related allowance recorded, recorded investment
Impaired loans with a related allowance recorded, unpaid principal balance
Impaired loans, related allowance
Impaired loans, recorded investment	1,908,000	1,911,000
Impaired loans, unpaid principal balance	1,941,000	2,915,000
Commercial Portfolio Segment [Member]
Impaired loans with no related allowance recorded, recorded investment
Impaired loans with no related allowance recorded, unpaid principal balance
Impaired loans with a related allowance recorded, recorded investment	232,000	231,000
Impaired loans with a related allowance recorded, unpaid principal balance	232,000	231,000
Impaired loans, related allowance	232,000	231,000
Impaired loans, recorded investment	232,000	231,000
Impaired loans, unpaid principal balance	232,000	231,000
Consumer Portfolio Segment [Member]
Impaired loans with no related allowance recorded, recorded investment	541,000	542,000
Impaired loans with no related allowance recorded, unpaid principal balance	630,000	631,000
Impaired loans with a related allowance recorded, recorded investment
Impaired loans with a related allowance recorded, unpaid principal balance
Impaired loans, related allowance
Impaired loans, recorded investment	541,000	542,000
Impaired loans, unpaid principal balance	630,000	631,000
Construction Portfolio Segment [Member]
Impaired loans with no related allowance recorded, recorded investment
Impaired loans with no related allowance recorded, unpaid principal balance	287,000
Impaired loans with a related allowance recorded, recorded investment
Impaired loans with a related allowance recorded, unpaid principal balance
Impaired loans, related allowance
Impaired loans, recorded investment
Impaired loans, unpaid principal balance	$ 287,000

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=84173941&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
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 15
-Subparagraph (a)(3)
-URI http://asc.fasb.org/extlink&oid=84173941&loc=d3e5212-111524

+ Details

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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=84173941&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=84173941&loc=SL6953550-111524

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- 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=84173941&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=84173941&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=84173941&loc=d3e5212-111524

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