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Note 2 - Fair Value of Financial Instruments - Level 3 Fair Value Measurements (Details) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Mar. 31, 2017	Dec. 31, 2016
Impaired Loans [Member] | Commercial Real Estate Portfolio Segment [Member] | Commercial Real Estate Owner Occupied [Member] | Market Approach Valuation Technique [Member]
Fair Value	$ 290	$ 3,536
Valuation Technique	Sales approach	Sales approach
Impaired Loans [Member] | Commercial Real Estate Portfolio Segment [Member] | Commercial Real Estate Owner Occupied [Member] | Market Approach Valuation Technique [Member] | Minimum [Member]
Range	15.70%	0.00%
Impaired Loans [Member] | Commercial Real Estate Portfolio Segment [Member] | Commercial Real Estate Owner Occupied [Member] | Market Approach Valuation Technique [Member] | Maximum [Member]
Range	52.00%	65.00%
Impaired Loans [Member] | Commercial Real Estate Portfolio Segment [Member] | Commercial Real Estate Owner Occupied [Member] | Market Approach Valuation Technique [Member] | Weighted Average [Member]
Range	31.70%	13.70%
Impaired Loans [Member] | Commercial Real Estate Portfolio Segment [Member] | Commercial Real Estate Owner Occupied [Member] | Cost Approach Valuation Technique [Member]
Fair Value
Valuation Technique		Cost approach
Impaired Loans [Member] | Commercial Real Estate Portfolio Segment [Member] | Commercial Real Estate Owner Occupied [Member] | Cost Approach Valuation Technique [Member] | Minimum [Member]
Range		0.00%
Impaired Loans [Member] | Commercial Real Estate Portfolio Segment [Member] | Commercial Real Estate Owner Occupied [Member] | Cost Approach Valuation Technique [Member] | Maximum [Member]
Range		29.50%
Impaired Loans [Member] | Commercial Real Estate Portfolio Segment [Member] | Commercial Real Estate Owner Occupied [Member] | Cost Approach Valuation Technique [Member] | Weighted Average [Member]
Range		14.80%
Impaired Loans [Member] | Commercial Real Estate Portfolio Segment [Member] | Commercial Real Estate Nonowner Occupied [Member] | Market Approach Valuation Technique [Member]
Fair Value	$ 2,462	$ 1,985
Valuation Technique	Sales approach	Sales approach
Impaired Loans [Member] | Commercial Real Estate Portfolio Segment [Member] | Commercial Real Estate Nonowner Occupied [Member] | Market Approach Valuation Technique [Member] | Minimum [Member]
Range	0.00%	0.00%
Impaired Loans [Member] | Commercial Real Estate Portfolio Segment [Member] | Commercial Real Estate Nonowner Occupied [Member] | Market Approach Valuation Technique [Member] | Maximum [Member]
Range	250.00%	250.00%
Impaired Loans [Member] | Commercial Real Estate Portfolio Segment [Member] | Commercial Real Estate Nonowner Occupied [Member] | Market Approach Valuation Technique [Member] | Weighted Average [Member]
Range	58.60%	58.60%
Impaired Loans [Member] | Commercial and Industrial Portfolio Segment [Member] | Market Approach Valuation Technique [Member]
Fair Value	$ 375	$ 298
Valuation Technique	Sales approach	Sales approach
Impaired Loans [Member] | Commercial and Industrial Portfolio Segment [Member] | Market Approach Valuation Technique [Member] | Minimum [Member]
Range	2.00%	0.90%
Impaired Loans [Member] | Commercial and Industrial Portfolio Segment [Member] | Market Approach Valuation Technique [Member] | Maximum [Member]
Range	14.20%	9.70%
Impaired Loans [Member] | Commercial and Industrial Portfolio Segment [Member] | Market Approach Valuation Technique [Member] | Weighted Average [Member]
Range	8.10%	5.20%
Other Real Estate Owned [Member] | Commercial Real Estate Portfolio Segment [Member] | Construction Loans [Member] | Market Approach Valuation Technique [Member]
Fair Value	$ 754	$ 754
Valuation Technique	Sales approach	Sales approach
Other Real Estate Owned [Member] | Commercial Real Estate Portfolio Segment [Member] | Construction Loans [Member] | Market Approach Valuation Technique [Member] | Minimum [Member]
Range	0.00%	0.00%
Other Real Estate Owned [Member] | Commercial Real Estate Portfolio Segment [Member] | Construction Loans [Member] | Market Approach Valuation Technique [Member] | Maximum [Member]
Range	30.00%	30.00%
Other Real Estate Owned [Member] | Commercial Real Estate Portfolio Segment [Member] | Construction Loans [Member] | Market Approach Valuation Technique [Member] | Weighted Average [Member]
Range	11.70%	11.70%

X

- Definition

This element represents the aggregate of the assets reported on the balance sheet at period end measured at fair value on a nonrecurring basis by the entity. This element is intended to be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements.

+ References

No definition available.

+ Details

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X

- Definition

Percentage of adjustment to the observed price for a similar asset or liability when an identical transaction does not exist, used as an input to measure fair value.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (bbb)
-URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19207-110258

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- Definition

Description of the inputs and valuation technique(s) used to measure fair value.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (bbb)
-URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19207-110258

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