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Note 2 - Investment Securities - Available For Sale Securities in Continuous Unrealized Loss Position (Details) - USD ($) $ in Thousands | Jun. 30, 2017 | Dec. 31, 2016
--- | --- | ---
Securities Available for Sale, Total Fair Value | $ 53,795 | $ 69,591
Securities Available for Sale, Total Unrealized Losses | (946) | (3,216)
Securities Available for Sale, Less than 12 Months Fair Value | 36,570 | 37,086
Securities Available for Sale, Less than 12 Months Unrealized Losses | (213) | (693)
Securities Available for Sale, 12 Months or Longer Fair Value | 17,225 | 32,505
Securities Available for Sale, 12 Months or Longer Unrealized Losses | (733) | (2,523)
US Treasury Securities [Member] |  |
Securities Available for Sale, Total Fair Value | 16,980 |
Securities Available for Sale, Total Unrealized Losses | (13) |
Securities Available for Sale, Less than 12 Months Fair Value | 16,980 |
Securities Available for Sale, Less than 12 Months Unrealized Losses | (13) |
Securities Available for Sale, 12 Months or Longer Fair Value |  |
Securities Available for Sale, 12 Months or Longer Unrealized Losses |  |
US States and Political Subdivisions Debt Securities [Member] |  |
Securities Available for Sale, Total Fair Value | 10,841 | 24,967
Securities Available for Sale, Total Unrealized Losses | (98) | (586)
Securities Available for Sale, Less than 12 Months Fair Value | 10,101 | 24,252
Securities Available for Sale, Less than 12 Months Unrealized Losses | (64) | (527)
Securities Available for Sale, 12 Months or Longer Fair Value | 740 | 715
Securities Available for Sale, 12 Months or Longer Unrealized Losses | (34) | (59)
Single Issue Trust Preferred Securities [Member] |  |
Securities Available for Sale, Total Fair Value | 8,943 | 19,939
Securities Available for Sale, Total Unrealized Losses | (417) | (2,165)
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 | 8,943 | 19,939
Securities Available for Sale, 12 Months or Longer Unrealized Losses | (417) | (2,165)
Mortgage-backed Agency Securities [Member] |  |
Securities Available for Sale, Total Fair Value | 17,031 | 24,685
Securities Available for Sale, Total Unrealized Losses | (418) | (465)
Securities Available for Sale, Less than 12 Months Fair Value | 9,489 | 12,834
Securities Available for Sale, Less than 12 Months Unrealized Losses | (136) | (166)
Securities Available for Sale, 12 Months or Longer Fair Value | 7,542 | 11,851
Securities Available for Sale, 12 Months or Longer Unrealized Losses | $ (282) | $ (299)

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- 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 + Details
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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 -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 + Details
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- Definition This item represents the aggregate fair value of investments in debt and equity securities in an unrealized loss position which are categorized neither as held-to-maturity nor trading securities. + 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 + Details
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- 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 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 -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27337-111563 + Details
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