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Note 2 - Investment Securities - Available For Sale Securities in Continuous Unrealized Loss Position (Details) - USD ($) $ in Thousands	Sep. 30, 2017	Dec. 31, 2016
Securities available for sale, less than 12 months, fair value	$ 54,282	$ 37,086
Securities available for sale, less than 12 months, unrealized losses	(120)	(693)
Securities available for sale, 12 months or longer, fair value	18,670	32,505
Securities available for sale, 12 months or longer, unrealized losses	(725)	(2,523)
Securities available for sale, total fair value	72,952	69,591
Securities available for sale, total unrealized losses	(845)	(3,216)
US Treasury Securities [Member]
Securities available for sale, less than 12 months, fair value	36,963
Securities available for sale, less than 12 months, unrealized losses	(9)
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	36,963
Securities available for sale, total unrealized losses	(9)
US States and Political Subdivisions Debt Securities [Member]
Securities available for sale, less than 12 months, fair value	9,421	24,252
Securities available for sale, less than 12 months, unrealized losses	(52)	(527)
Securities available for sale, 12 months or longer, fair value	1,427	715
Securities available for sale, 12 months or longer, unrealized losses	(36)	(59)
Securities available for sale, total fair value	10,848	24,967
Securities available for sale, total unrealized losses	(88)	(586)
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	8,962	19,939
Securities available for sale, 12 months or longer, unrealized losses	(401)	(2,165)
Securities available for sale, total fair value	8,962	19,939
Securities available for sale, total unrealized losses	(401)	(2,165)
Mortgage-backed Agency Securities [Member]
Securities available for sale, less than 12 months, fair value	7,898	12,834
Securities available for sale, less than 12 months, unrealized losses	(59)	(166)
Securities available for sale, 12 months or longer, fair value	8,281	11,851
Securities available for sale, 12 months or longer, unrealized losses	(288)	(299)
Securities available for sale, total fair value	16,179	24,685
Securities available for sale, total unrealized losses	$ (347)	$ (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

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-Publisher FASB
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+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
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-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
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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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