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Note 4 - Loans and Allowance for Loan Losses - Allowance for Loan Losses Activity by Portfolio Segment (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Balance	$ 6,952	$ 6,934	$ 6,952	$ 6,934
Balance	7,315	6,946	7,699	6,648
Provision for loan losses	175	141	320	620
Loans charged off	(909)	(472)	(1,866)	(1,059)
Recoveries	371	319	799	725
Residential Portfolio Segment [Member]
Balance	1,300	906	1,300	906
Balance	1,392	1,185	939	1,087
Provision for loan losses	(68)	(258)	377	(218)
Loans charged off	(73)	(67)	(146)	(171)
Recoveries	49	46	130	208
Commercial Real Estate Portfolio Segment [Member]
Balance	2,813	3,464	2,813	3,464
Balance	2,729	1,995	4,315	1,959
Provision for loan losses	(89)	1,445	(1,176)	1,462
Loans charged off	(53)	(52)	(612)	(52)
Recoveries	226	76	286	95
Commercial and Industrial Portfolio Segment [Member]
Balance	932	1,416	932	1,416
Balance	1,360	2,672	907	2,589
Provision for loan losses	(35)	(1,266)	350	(1,184)
Loans charged off	(399)		(403)
Recoveries	6	10	78	11
Consumer Portfolio Segment [Member]
Balance	1,907	1,148	1,907	1,148
Balance	1,834	1,094	1,538	1,013
Provision for loan losses	367	220	769	560
Loans charged off	(384)	(353)	(705)	(836)
Recoveries	$ 90	$ 187	$ 305	$ 411

X

- Definition

A valuation allowance for financing receivables that are expected to be uncollectible.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 11B
-Subparagraph (c)(1)
-URI http://asc.fasb.org/extlink&oid=84173941&loc=SL6953423-111524

+ Details

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Balance Type:	credit
Period Type:	instant

X

- Definition

Amount of recovery of financing receivables doubtful of collection that were previously charged off.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 11B
-Subparagraph (c)(4)
-URI http://asc.fasb.org/extlink&oid=84173941&loc=SL6953423-111524

+ Details

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

X

- Definition

Amount of direct write-downs of financing receivables charged against the allowance.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 11B
-Subparagraph (c)(3)
-URI http://asc.fasb.org/extlink&oid=84173941&loc=SL6953423-111524

+ Details

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

X

- Definition

Amount of expense related loan transactions, lease transactions, credit loss from transactions other than loan and lease transactions, and other loss based on assessment of uncollectability from the counterparty to reduce the account to their net realizable value.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 11B
-Subparagraph (c)(2)
-URI http://asc.fasb.org/extlink&oid=84173941&loc=SL6953423-111524

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 225
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-04.11)
-URI http://asc.fasb.org/extlink&oid=6879574&loc=d3e536633-122882

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3602-108585

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- Details

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