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Note 3 - Available-for-sale Securities - Investment Securities in a Continuous Loss Position (Details) - USD ($) $ in Thousands | Mar. 31, 2019 | Dec. 31, 2018
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Available-for-sale securities in continuous loss position, less than 12 months, fair value | $ 2,972 | $ 8,024
Available-for-sale securities in continuous loss position, less than 12 months, unrealized loss | (23) | (38)
Available-for-sale securities in continuous loss position, 12 months or more, fair value | 16,606 | 18,396
Available-for-sale securities in continuous loss position, 12 months or more, unrealized loss | (1,274) | (1,184)
Available-for-sale securities in continuous loss position, fair value | 19,578 | 26,420
Available-for-sale securities in continuous loss position, unrealized loss | (1,297) | (1,222)
Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member] |  |
Available-for-sale securities in continuous loss position, less than 12 months, fair value | 2,972 | 8,024
Available-for-sale securities in continuous loss position, less than 12 months, unrealized loss | (23) | (38)
Available-for-sale securities in continuous loss position, 12 months or more, fair value | 3,778 | 5,422
Available-for-sale securities in continuous loss position, 12 months or more, unrealized loss | (102) | (158)
Available-for-sale securities in continuous loss position, fair value | 6,750 | 13,446
Available-for-sale securities in continuous loss position, unrealized loss | (125) | (196)
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 | 12,828 | 12,974
Available-for-sale securities in continuous loss position, 12 months or more, unrealized loss | (1,172) | (1,026)
Available-for-sale securities in continuous loss position, fair value | 12,828 | 12,974
Available-for-sale securities in continuous loss position, unrealized loss | $ (1,172) | $ (1,026)

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- Definition Amount of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), in continuous unrealized loss position for more than 12 months, without allowance for credit loss. Includes beneficial interest in securitized financial asset. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 30 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=118955579&loc=SL82922890-210455 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=118939692&loc=d3e27337-111563 Reference 3: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 30 -Section 55 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=118942371&loc=SL82922954-210456 + Details
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- Definition Amount of accumulated unrealized loss on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), in continuous unrealized loss position for 12 months or longer, without allowance for credit loss. Includes beneficial interest in securitized financial asset. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=118939692&loc=d3e27337-111563 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 30 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=118955579&loc=SL82922890-210455 + Details
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- Definition Amount of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), in continuous unrealized loss position for less than 12 months, without allowance for credit loss. Includes beneficial interest in securitized financial asset. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=118939692&loc=d3e27337-111563 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 30 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=118955579&loc=SL82922890-210455 Reference 3: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 30 -Section 55 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=118942371&loc=SL82922954-210456 + Details
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