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Note 3 - Loans Receivable and Allowance for Loan Losses - Impaired Loans (Additional Information) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Impaired loans with a related allowance recorded, average recorded investment	$ 232	$ 2,979	$ 232	$ 1,916
Impaired loans with a related allowance recorded, interest income recognized
Impaired loans, average recorded investment	8,905	15,689	8,932	14,742
Impaired loans, interest income recognized	83	115	163	230
Impaired loans with no related allowance recorded, average recorded investment	8,673	12,710	8,700	12,826
Impaired loans with no allowance recorded, interest income recognized	83	115	163	230
Commercial Real Estate Portfolio Segment [Member]
Impaired loans with a related allowance recorded, average recorded investment			232	1,914
Impaired loans with a related allowance recorded, interest income recognized
Impaired loans, average recorded investment	6,188	7,524	6,213	7,597
Impaired loans, interest income recognized	75	79	148	159
Impaired loans with no related allowance recorded, average recorded investment	6,188	7,524	6,213	7,597
Impaired loans with no allowance recorded, interest income recognized	75	79	148	159
Residential Portfolio Segment [Member]
Impaired loans with a related allowance recorded, average recorded investment
Impaired loans with a related allowance recorded, interest income recognized
Impaired loans, average recorded investment	1,907	4,525	1,909	4,535
Impaired loans, interest income recognized	3	31	5	62
Impaired loans with no related allowance recorded, average recorded investment	1,907	4,525	1,909	4,535
Impaired loans with no allowance recorded, interest income recognized	3	31	5	62
Commercial Portfolio Segment [Member]
Impaired loans with a related allowance recorded, average recorded investment	232	2,977
Impaired loans with a related allowance recorded, interest income recognized
Impaired loans, average recorded investment	269	3,093	269	2,062
Impaired loans, interest income recognized
Impaired loans with no related allowance recorded, average recorded investment	37	116	37	148
Impaired loans with no allowance recorded, interest income recognized
Consumer Portfolio Segment [Member]
Impaired loans with a related allowance recorded, average recorded investment		2		2
Impaired loans with a related allowance recorded, interest income recognized
Impaired loans, average recorded investment	541	547	541	548
Impaired loans, interest income recognized	5	5	10	9
Impaired loans with no related allowance recorded, average recorded investment	541	545	541	546
Impaired loans with no allowance recorded, interest income recognized	$ 5	$ 5	$ 10	$ 9

X

- Definition

Average 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 15
-Subparagraph (c)(1)
-URI http://asc.fasb.org/extlink&oid=84173941&loc=d3e5212-111524

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 17
-URI http://asc.fasb.org/extlink&oid=84173941&loc=d3e5258-111524

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

Amount of interest income recognized that the financing receivables (with related allowance for credit losses and without a related allowance for credit losses) were impaired.

+ 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 (c)(2)
-URI http://asc.fasb.org/extlink&oid=84173941&loc=d3e5212-111524

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

X

- Definition

Amount of average investment 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 17
-URI http://asc.fasb.org/extlink&oid=84173941&loc=d3e5258-111524

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 15
-Subparagraph (c)(1)
-URI http://asc.fasb.org/extlink&oid=84173941&loc=d3e5212-111524

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X

- Definition

Amount of interest income, recognized on accrual basis, on financing receivables that are recognized as impaired, 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 (c)(2)
-URI http://asc.fasb.org/extlink&oid=84173941&loc=d3e5212-111524

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Period Type:	duration

X

- Definition

Amount of average investment 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 (c)(1)
-URI http://asc.fasb.org/extlink&oid=84173941&loc=d3e5212-111524

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 17
-URI http://asc.fasb.org/extlink&oid=84173941&loc=d3e5258-111524

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X

- Definition

Amount of interest income, recognized on accrual basis, on financing receivables, for which there is a related allowance for credit losses and are recognized as impaired.

+ 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 (c)(2)
-URI http://asc.fasb.org/extlink&oid=84173941&loc=d3e5212-111524

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