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Note 3 - Investment Securities (Details Textual) $ in Thousands	12 Months Ended
	Dec. 31, 2017 USD ($)	Dec. 31, 2016 USD ($)	Dec. 31, 2015 USD ($)
Number of Securities in Unrealized Loss Position	45	82
Percentage of Combined Depreciation of Combined Reported Value of Aggregate Securities Portfolio	0.57%	1.51%
Number of Securities in Unrealized Loss Position, Greater than or Equal to One Year	24
Other than Temporary Impairment Losses, Investments, Portion Recognized in Earnings, Net		$ 4,646
Available-for-sale Securities Pledged as Collateral	51,340	139,750
Debt Securities [Member]
Other than Temporary Impairment Losses, Investments, Portion Recognized in Earnings, Net	0	4,640	0
Equity Securities [Member]
Other than Temporary Impairment Losses, Investments, Portion Recognized in Earnings, Net	$ 0	$ 11	$ 0

X

- Definition

Represents the number of securities in unrealized loss position.

+ References

No definition available.

+ Details

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X

- Definition

Number of investment positions that have been in a continuous unrealized loss position for greater than or equal to a year.

+ References

No definition available.

+ Details

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X

- Definition

Represents the percentage of combined depreciation of combined reported value of aggregate securities portfolio.

+ References

No definition available.

+ Details

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X

- Definition

The fair value of available-for-sale securities that serve as collateral for borrowings.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=84173941&loc=d3e5086-111524

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- Definition

The amount of other than temporary impairment (OTTI) losses on equity securities, OTTI related to credit losses on debt securities, and OTTI losses on debt securities when the entity intends to sell the securities or it is more likely than not that the entity will be required to sell the securities before recovery of its amortized cost basis. Additionally, this item includes OTTI losses recognized during the period on investments accounted for under the cost method of accounting.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 8B
-URI http://asc.fasb.org/extlink&oid=82897076&loc=SL6284393-111563

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