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Note 3 - Investment Securities - Available For Sale Securities in Continuous Unrealized Loss Position (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Securities available for sale, less than 12 months, fair value	$ 42,349	$ 37,086
Securities available for sale, less than 12 months, unrealized losses	(106)	(693)
Securities available for sale, 12 months or longer, fair value	25,267	32,505
Securities available for sale, 12 months or longer, unrealized losses	(925)	(2,523)
Securities available for sale, total fair value	67,616	69,591
Securities available for sale, total unrealized losses	(1,031)	(3,216)
US Government Agencies Debt Securities [Member]
Securities available for sale, less than 12 months, fair value	10,054
Securities available for sale, less than 12 months, unrealized losses	(10)
Securities available for sale, 12 months or longer, fair value
Securities available for sale, 12 months or longer, unrealized losses
Securities available for sale, total fair value	10,054
Securities available for sale, total unrealized losses	(10)
US States and Political Subdivisions Debt Securities [Member]
Securities available for sale, less than 12 months, fair value	8,047	24,252
Securities available for sale, less than 12 months, unrealized losses	(55)	(527)
Securities available for sale, 12 months or longer, fair value	2,314	715
Securities available for sale, 12 months or longer, unrealized losses	(52)	(59)
Securities available for sale, total fair value	10,361	24,967
Securities available for sale, total unrealized losses	(107)	(586)
US Treasury Securities [Member]
Securities available for sale, less than 12 months, fair value	19,972
Securities available for sale, less than 12 months, unrealized losses	(16)
Securities available for sale, 12 months or longer, fair value
Securities available for sale, 12 months or longer, unrealized losses
Securities available for sale, total fair value	19,972
Securities available for sale, total unrealized losses	(16)
Single Issue Trust Preferred Securities [Member]
Securities available for sale, less than 12 months, fair value
Securities available for sale, less than 12 months, unrealized losses
Securities available for sale, 12 months or longer, fair value	8,884	19,939
Securities available for sale, 12 months or longer, unrealized losses	(483)	(2,165)
Securities available for sale, total fair value	8,884	19,939
Securities available for sale, total unrealized losses	(483)	(2,165)
Mortgage-backed Agency Securities [Member]
Securities available for sale, less than 12 months, fair value	4,276	12,834
Securities available for sale, less than 12 months, unrealized losses	(25)	(166)
Securities available for sale, 12 months or longer, fair value	14,069	11,851
Securities available for sale, 12 months or longer, unrealized losses	(390)	(299)
Securities available for sale, total fair value	18,345	24,685
Securities available for sale, total unrealized losses	$ (415)	$ (465)

X

- Definition

Amount of accumulated unrealized loss on investments in debt and equity securities classified as available-for-sale that have been in a continuous loss position for twelve months or longer.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 6
-Subparagraph (a)(2)
-URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27290-111563

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 7
-URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27337-111563

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- Definition

Amount of accumulated unrealized loss on investments in debt and equity securities classified as available-for-sale in a continuous loss position.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 7
-URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27337-111563

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
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-URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27290-111563

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+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 6
-Subparagraph (a)(1)
-URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27290-111563

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Amount of accumulated unrealized loss on investments in debt and equity securities classified as available-for-sale that have been in a continuous loss position for less than twelve months.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 6
-Subparagraph (a)(2)
-URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27290-111563

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
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-URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27337-111563

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+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 7
-URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27337-111563

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+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
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