Note 4 - Loans and Allowance for Loan Losses - Allowance for Loan Losses Activity by Portfolio Segment (Details) - USD ($) $ in Thousands	3 Months Ended
Mar. 31, 2017	Mar. 31, 2016
Balance	$ 7,699	$ 6,648
Provision for loan losses	145	479
Loans charged off	(957)	(587)
Recoveries	428	406
Balance	7,315	6,946
Residential Portfolio Segment [Member]
Balance	939	1,087
Provision for loan losses	445	40
Loans charged off	(73)	(104)
Recoveries	81	162
Balance	1,392	1,185
Commercial Real Estate Portfolio Segment [Member]
Balance	4,315	1,959
Provision for loan losses	(1,087)	17
Loans charged off	(559)
Recoveries	60	19
Balance	2,729	1,995
Commercial and Industrial Portfolio Segment [Member]
Balance	907	2,589
Provision for loan losses	385	82
Loans charged off	(4)
Recoveries	72	1
Balance	1,360	2,672
Consumer Portfolio Segment [Member]
Balance	1,538	1,013
Provision for loan losses	402	340
Loans charged off	(321)	(483)
Recoveries	215	224
Balance	$ 1,834	$ 1,094

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

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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

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

+ References

+ Details

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- Definition

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

+ References

+ Details

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- 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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