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Note 3 - Available-for-sale Securities (Details) - Investment Securities in a Continuous Loss Position - USD ($) $ in Thousands | Dec. 31, 2015 | Dec. 31, 2014
--- | --- | ---
2015 |  |
Available-for-sale securities in continuous loss position, less than 12 months, fair value | $ 7,817 | $ 0
Available-for-sale securities in continuous loss position, less than 12 months, unrealized loss | (88) | 0
Available-for-sale securities in continuous loss position, 12 months or more, fair value | 16,489 | 33,682
Available-for-sale securities in continuous loss position, 12 months or more, unrealized loss | (231) | (453)
Available-for-sale securities in continuous loss position, fair value | 24,306 | 33,682
Available-for-sale securities in continuous loss position, unrealized loss | (319) | (453)
US Government Agencies Debt Securities [Member] |  |
2015 |  |
Available-for-sale securities in continuous loss position, less than 12 months, fair value | 4,954 | 0
Available-for-sale securities in continuous loss position, less than 12 months, unrealized loss | (46) | 0
Available-for-sale securities in continuous loss position, 12 months or more, fair value | 0 | 7,409
Available-for-sale securities in continuous loss position, 12 months or more, unrealized loss | 0 | (91)
Available-for-sale securities in continuous loss position, fair value | 4,954 | 7,409
Available-for-sale securities in continuous loss position, unrealized loss | (46) | (91)
Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member] |  |
2015 |  |
Available-for-sale securities in continuous loss position, less than 12 months, fair value | 2,863 | 0
Available-for-sale securities in continuous loss position, less than 12 months, unrealized loss | (42) | 0
Available-for-sale securities in continuous loss position, 12 months or more, fair value | 10,550 | 17,337
Available-for-sale securities in continuous loss position, 12 months or more, unrealized loss | (170) | (298)
Available-for-sale securities in continuous loss position, fair value | 13,413 | 17,337
Available-for-sale securities in continuous loss position, unrealized loss | (212) | (298)
Corporate Debt Securities [Member] |  |
2015 |  |
Available-for-sale securities in continuous loss position, less than 12 months, fair value | 0 | 0
Available-for-sale securities in continuous loss position, less than 12 months, unrealized loss | 0 | 0
Available-for-sale securities in continuous loss position, 12 months or more, fair value | 5,939 | 8,936
Available-for-sale securities in continuous loss position, 12 months or more, unrealized loss | (61) | (64)
Available-for-sale securities in continuous loss position, fair value | 5,939 | 8,936
Available-for-sale securities in continuous loss position, unrealized loss | $ (61) | $ (64)

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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=27724398&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=27724398&loc=d3e27337-111563 + Details
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