Note 2 - Fair Value of Financial Instruments (Details) - Level 3 Fair Value Measurements - Market Approach Valuation Technique [Member] - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
Mar. 31, 2016	Dec. 31, 2015
Commercial Real Estate Portfolio Segment [Member] \| Commercial Real Estate Nonowner Occupied [Member] \| Impaired Loans [Member]
Commercial real estate:
Fair value (in Dollars)	$ 2,375	$ 2,473
Valuation technique	Sales approach	Sales approach
Commercial Real Estate Portfolio Segment [Member] \| Construction Loans [Member] \| Other Real Estate Owned [Member]
Commercial real estate:
Fair value (in Dollars)	$ 1,147	$ 1,147
Valuation technique	Sales approach	Sales approach
Commercial Real Estate Portfolio Segment [Member] \| Minimum [Member] \| Commercial Real Estate Nonowner Occupied [Member] \| Impaired Loans [Member]
Commercial real estate:
Adjustment to comparables	0.00%	0.00%
Commercial Real Estate Portfolio Segment [Member] \| Minimum [Member] \| Construction Loans [Member] \| Other Real Estate Owned [Member]
Commercial real estate:
Adjustment to comparables	5.00%	0.00%
Commercial Real Estate Portfolio Segment [Member] \| Weighted Average [Member] \| Commercial Real Estate Nonowner Occupied [Member] \| Impaired Loans [Member]
Commercial real estate:
Adjustment to comparables	5.70%	5.70%
Commercial Real Estate Portfolio Segment [Member] \| Weighted Average [Member] \| Construction Loans [Member] \| Other Real Estate Owned [Member]
Commercial real estate:
Adjustment to comparables	18.00%	15.20%
Commercial Real Estate Portfolio Segment [Member] \| Maximum [Member] \| Commercial Real Estate Nonowner Occupied [Member] \| Impaired Loans [Member]
Commercial real estate:
Adjustment to comparables	12.50%	12.50%
Commercial Real Estate Portfolio Segment [Member] \| Maximum [Member] \| Construction Loans [Member] \| Other Real Estate Owned [Member]
Commercial real estate:
Adjustment to comparables	35.00%	35.00%
Commercial Portfolio Segment [Member] \| Impaired Loans [Member]
Commercial real estate:
Fair value (in Dollars)	$ 3,905	$ 3,779
Valuation technique	Sales approach	Sales approach
Commercial Portfolio Segment [Member] \| Minimum [Member] \| Impaired Loans [Member]
Commercial real estate:
Adjustment to comparables	0.90%	0.90%
Commercial Portfolio Segment [Member] \| Weighted Average [Member] \| Impaired Loans [Member]
Commercial real estate:
Adjustment to comparables	14.40%	14.30%
Commercial Portfolio Segment [Member] \| Maximum [Member] \| Impaired Loans [Member]
Commercial real estate:
Adjustment to comparables	30.00%	30.00%

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- 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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- 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

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