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Note 13 - Fair Value - Assets and Liabilities Measured at Fair Value on Recurring Basis (Details) - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017
Available-for-sale debt securities	$ 163,593	$ 165,525	[1]
Derivative assets	145
Derivative liabilities		90
Fair Value, Measurements, Recurring [Member]
Available-for-sale debt securities	163,593	165,525
Equity securities	55	55
Fair value loans	5,730	5,739
Deferred compensation assets	3,779	4,002
Derivative assets	145
Deferred compensation liabilities	3,779	4,002
Derivative liabilities		90
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 [Member]
Available-for-sale debt securities
Equity securities	55	55
Fair value loans
Deferred compensation assets	3,779	4,002
Derivative assets
Deferred compensation liabilities	3,779	4,002
Derivative liabilities
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member]
Available-for-sale debt securities	163,593	165,525
Equity securities
Fair value loans		5,739
Deferred compensation assets
Derivative assets	145
Deferred compensation liabilities
Derivative liabilities		90
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3 [Member]
Available-for-sale debt securities
Equity securities
Fair value loans	5,730
Deferred compensation assets
Derivative assets
Deferred compensation liabilities
Derivative liabilities
Fair Value, Measurements, Recurring [Member] | US Government Agencies Debt Securities [Member]
Available-for-sale debt securities	1,141	11,296
Fair Value, Measurements, Recurring [Member] | US Government Agencies Debt Securities [Member] | Fair Value, Inputs, Level 1 [Member]
Available-for-sale debt securities
Fair Value, Measurements, Recurring [Member] | US Government Agencies Debt Securities [Member] | Fair Value, Inputs, Level 2 [Member]
Available-for-sale debt securities	1,141	11,296
Fair Value, Measurements, Recurring [Member] | US Government Agencies Debt Securities [Member] | Fair Value, Inputs, Level 3 [Member]
Available-for-sale debt securities
Fair Value, Measurements, Recurring [Member] | US Treasury Securities [Member]
Available-for-sale debt securities	29,888	19,971
Fair Value, Measurements, Recurring [Member] | US Treasury Securities [Member] | Fair Value, Inputs, Level 1 [Member]
Available-for-sale debt securities
Fair Value, Measurements, Recurring [Member] | US Treasury Securities [Member] | Fair Value, Inputs, Level 2 [Member]
Available-for-sale debt securities	29,888	19,971
Fair Value, Measurements, Recurring [Member] | US Treasury Securities [Member] | Fair Value, Inputs, Level 3 [Member]
Available-for-sale debt securities
Fair Value, Measurements, Recurring [Member] | US States and Political Subdivisions Debt Securities [Member]
Available-for-sale debt securities	97,511	103,648
Fair Value, Measurements, Recurring [Member] | US States and Political Subdivisions Debt Securities [Member] | Fair Value, Inputs, Level 1 [Member]
Available-for-sale debt securities
Fair Value, Measurements, Recurring [Member] | US States and Political Subdivisions Debt Securities [Member] | Fair Value, Inputs, Level 2 [Member]
Available-for-sale debt securities	97,511	103,648
Fair Value, Measurements, Recurring [Member] | US States and Political Subdivisions Debt Securities [Member] | Fair Value, Inputs, Level 3 [Member]
Available-for-sale debt securities
Fair Value, Measurements, Recurring [Member] | Mortgage-backed Agency Securities [Member]
Available-for-sale debt securities	35,053	21,726
Fair Value, Measurements, Recurring [Member] | Mortgage-backed Agency Securities [Member] | Fair Value, Inputs, Level 1 [Member]
Available-for-sale debt securities
Fair Value, Measurements, Recurring [Member] | Mortgage-backed Agency Securities [Member] | Fair Value, Inputs, Level 2 [Member]
Available-for-sale debt securities	35,053	21,726
Fair Value, Measurements, Recurring [Member] | Mortgage-backed Agency Securities [Member] | Fair Value, Inputs, Level 3 [Member]
Available-for-sale debt securities
Fair Value, Measurements, Recurring [Member] | Single Issue Trust Preferred Securities [Member]
Available-for-sale debt securities		8,884
Fair Value, Measurements, Recurring [Member] | Single Issue Trust Preferred Securities [Member] | Fair Value, Inputs, Level 1 [Member]
Available-for-sale debt securities
Fair Value, Measurements, Recurring [Member] | Single Issue Trust Preferred Securities [Member] | Fair Value, Inputs, Level 2 [Member]
Available-for-sale debt securities		8,884
Fair Value, Measurements, Recurring [Member] | Single Issue Trust Preferred Securities [Member] | Fair Value, Inputs, Level 3 [Member]
Available-for-sale debt securities
[1] Derived from audited financial statements

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+ References

No definition available.

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+ References

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- Definition

Amount of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 45
-Paragraph 1
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=109979856&loc=d3e26610-111562

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Amount of equity securities categorized neither as held-to-maturity nor as trading.

+ References

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Fair value, after the effects of master netting arrangements, of a financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes assets not subject to a master netting arrangement and not elected to be offset.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 20
-Section 55
-Paragraph 10
-URI http://asc.fasb.org/extlink&oid=99393222&loc=SL20226008-175313

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
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-Name Accounting Standards Codification
-Topic 825
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-Section 50
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-Topic 210
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+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 20
-Section 50
-Paragraph 3
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-URI http://asc.fasb.org/extlink&oid=51824906&loc=SL20225862-175312

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- Definition

Fair value portion of loan receivable, including, but not limited to, mortgage loans held for investment, finance receivables held for investment, policy loans on insurance contracts.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-URI http://asc.fasb.org/subtopic&trid=2196772

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