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Note 4 - Loans and Allowance for Loan Losses - Allowance for Loan Losses and the Recorded Investment of Loans Based On Impairment Method (Details) - USD ($) $ in Thousands	Mar. 31, 2017	Dec. 31, 2016	Mar. 31, 2016	Dec. 31, 2015
Individually evaluated for impairment	$ 545	$ 2,981
Collectively evaluated for impairment	6,770	4,718
Total ending allowance balance	7,315	7,699	$ 6,946	$ 6,648
Loans individually evaluated for impairment	17,728	22,709
Loans collectively evaluated for impairment	721,133	712,192
Total ending loans balance	738,861	734,901
Residential Portfolio Segment [Member]
Individually evaluated for impairment
Collectively evaluated for impairment	1,392	939
Total ending allowance balance	1,392	939	1,185	1,087
Loans individually evaluated for impairment	915	717
Loans collectively evaluated for impairment	286,246	285,305
Total ending loans balance	287,161	286,022
Commercial Real Estate Portfolio Segment [Member]
Individually evaluated for impairment	153	2,535
Collectively evaluated for impairment	2,576	1,780
Total ending allowance balance	2,729	4,315	1,995	1,959
Loans individually evaluated for impairment	7,701	13,111
Loans collectively evaluated for impairment	203,873	200,896
Total ending loans balance	211,574	214,007
Commercial and Industrial Portfolio Segment [Member]
Individually evaluated for impairment	391	241
Collectively evaluated for impairment	969	666
Total ending allowance balance	1,360	907	2,672	2,589
Loans individually evaluated for impairment	8,903	8,465
Loans collectively evaluated for impairment	96,760	92,124
Total ending loans balance	105,663	100,589
Consumer Portfolio Segment [Member]
Individually evaluated for impairment	1	205
Collectively evaluated for impairment	1,833	1,333
Total ending allowance balance	1,834	1,538	$ 1,094	$ 1,013
Loans individually evaluated for impairment	209	416
Loans collectively evaluated for impairment	134,254	133,867
Total ending loans balance	$ 134,463	$ 134,283

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

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X

- Definition

The valuation allowance for financing receivables that are expected to be uncollectible that were collectively evaluated for impairment.

+ 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 (g)
-URI http://asc.fasb.org/extlink&oid=84173941&loc=SL6953423-111524

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- Definition

Amount of valuation allowance for financing receivables that are expected to be uncollectible that were individually evaluated for impairment.

+ 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 (g)
-URI http://asc.fasb.org/extlink&oid=84173941&loc=SL6953423-111524

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X

- Definition

The balance of financing receivables that were collectively evaluated for impairment.

+ 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 (h)
-URI http://asc.fasb.org/extlink&oid=84173941&loc=SL6953423-111524

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- Definition

The balance of financing receivables that were individually evaluated for impairment.

+ 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 (h)
-URI http://asc.fasb.org/extlink&oid=84173941&loc=SL6953423-111524

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- Definition

Amount before allowance and after deduction of deferred interest and fees, unamortized costs and premiums and discounts from face amounts, of loans and leases held in portfolio, including but not limited to, commercial and consumer loans. Excludes loans and leases covered under loss sharing agreements.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 45
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=82891408&loc=d3e4428-111522

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 4
-URI http://asc.fasb.org/extlink&oid=84173941&loc=d3e5074-111524

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