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Note 2 - Investment Securities - Securities Available For Sale (Details) - USD ($) $ in Thousands	Jun. 30, 2017	Dec. 31, 2016
Securities available for sale, Amortized Cost	$ 155,770	$ 166,450
Securities available for sale, Unrealized Gains	3,030	2,345
Securities available for sale, Unrealized Losses	(946)	(3,216)
Securities available for sale	157,854	165,579
US Treasury Securities [Member]
Securities available for sale, Amortized Cost	16,993
Securities available for sale, Unrealized Gains
Securities available for sale, Unrealized Losses	(13)
Securities available for sale	16,980
US Government Agencies Debt Securities [Member]
Securities available for sale, Amortized Cost	1,283	1,342
Securities available for sale, Unrealized Gains	17	3
Securities available for sale, Unrealized Losses
Securities available for sale	1,300	1,345
US States and Political Subdivisions Debt Securities [Member]
Securities available for sale, Amortized Cost	104,089	111,659
Securities available for sale, Unrealized Gains	2,918	2,258
Securities available for sale, Unrealized Losses	(98)	(586)
Securities available for sale	106,909	113,331
Single Issue Trust Preferred Securities [Member]
Securities available for sale, Amortized Cost	9,360	22,104
Securities available for sale, Unrealized Gains
Securities available for sale, Unrealized Losses	(417)	(2,165)
Securities available for sale	8,943	19,939
Mortgage-backed Agency Securities [Member]
Securities available for sale, Amortized Cost	23,990	31,290
Securities available for sale, Unrealized Gains	77	66
Securities available for sale, Unrealized Losses	(418)	(465)
Securities available for sale	23,649	30,891
Equity Securities [Member]
Securities available for sale, Amortized Cost	55	55
Securities available for sale, Unrealized Gains	18	18
Securities available for sale, Unrealized Losses
Securities available for sale	$ 73	$ 73

X

- Definition

Amount of investment in debt and equity securities categorized neither as held-to-maturity nor trading.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 25
-Paragraph 1
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=75030427&loc=d3e22054-111558

Reference 2: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 45
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=82896770&loc=d3e26610-111562

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X

- Definition

Amount before tax of unrealized gain in accumulated other comprehensive income (AOCI) on investments in debt and equity securities classified as available-for-sale.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27161-111563

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- Definition

Amount before tax of unrealized loss in accumulated other comprehensive income (AOCI) on investments in debt and equity securities classified as available-for-sale.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27161-111563

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X

- Definition

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+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.2)
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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