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Note 21 - Fair Value of Financial Instruments - Assets and Liabilities Measured at Fair Value Using Significant Unobservable Inputs (Level 3) (Details) - Fair Value, Inputs, Level 3 [Member] $ in Thousands	12 Months Ended
	Dec. 31, 2017 USD ($)
Other Assets [Member]
Fair value	$ 228
Minimum [Member] | Other Assets [Member]
Quantitative range of unobservable inputs	9.00%
Weighted Average [Member] | Other Assets [Member]
Quantitative range of unobservable inputs	9.50%
Maximum [Member] | Other Assets [Member]
Quantitative range of unobservable inputs	10.00%
Impaired Loans [Member]
Fair value	$ 694
Impaired Loans [Member] | Minimum [Member]
Quantitative range of unobservable inputs	9.00%
Impaired Loans [Member] | Weighted Average [Member]
Quantitative range of unobservable inputs	9.50%
Impaired Loans [Member] | Maximum [Member]
Quantitative range of unobservable inputs	10.00%
OREO [Member]
Fair value	$ 3,792
OREO [Member] | Minimum [Member]
Quantitative range of unobservable inputs	9.00%
OREO [Member] | Weighted Average [Member]
Quantitative range of unobservable inputs	9.50%
OREO [Member] | Maximum [Member]
Quantitative range of unobservable inputs	10.00%

X

- Definition

Fair value portion of probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.

+ 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 (a)
-URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19207-110258

+ Details

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Period Type:	instant

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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