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Note 3 - Available-for-sale Securities - Investment Securities in a Continuous Loss Position (Details) - USD ($) $ in Thousands | Dec. 31, 2016 | Dec. 31, 2015
--- | --- | ---
Available-for-sale securities in continuous loss position, less than 12 months, fair value | $ 5,969 | $ 7,817
Available-for-sale securities in continuous loss position, less than 12 months, unrealized loss | 144 | 88
Available-for-sale securities in continuous loss position, 12 months or more, fair value | 9,317 | 16,489
Available-for-sale securities in continuous loss position, 12 months or more, unrealized loss | 87 | 231
Available-for-sale securities in continuous loss position, fair value | 15,286 | 24,306
Available-for-sale securities in continuous loss position, unrealized loss | 231 | 319
Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member] |  |
Available-for-sale securities in continuous loss position, less than 12 months, fair value | 5,969 | 2,863
Available-for-sale securities in continuous loss position, less than 12 months, unrealized loss | 144 | 42
Available-for-sale securities in continuous loss position, 12 months or more, fair value | 3,356 | 10,550
Available-for-sale securities in continuous loss position, 12 months or more, unrealized loss | 48 | 170
Available-for-sale securities in continuous loss position, fair value | 9,325 | 13,413
Available-for-sale securities in continuous loss position, unrealized loss | 192 | 212
US Government Agencies Debt Securities [Member] |  |
Available-for-sale securities in continuous loss position, less than 12 months, fair value |  | 4,954
Available-for-sale securities in continuous loss position, less than 12 months, unrealized loss |  | 46
Available-for-sale securities in continuous loss position, 12 months or more, fair value |  |
Available-for-sale securities in continuous loss position, 12 months or more, unrealized loss |  |
Available-for-sale securities in continuous loss position, fair value |  | 4,954
Available-for-sale securities in continuous loss position, unrealized loss |  | 46
Corporate Debt Securities [Member] |  |
Available-for-sale securities in continuous loss position, less than 12 months, fair value |  |
Available-for-sale securities in continuous loss position, less than 12 months, unrealized loss |  |
Available-for-sale securities in continuous loss position, 12 months or more, fair value | 5,961 | 5,939
Available-for-sale securities in continuous loss position, 12 months or more, unrealized loss | 39 | 61
Available-for-sale securities in continuous loss position, fair value | 5,961 | 5,939
Available-for-sale securities in continuous loss position, unrealized loss | $ 39 | $ 61

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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=73527792&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=73527792&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=73527792&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=73527792&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=73527792&loc=d3e27290-111563 + Details
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