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Note 3 - Available-for-sale Securities - Investment Securities in a Continuous Loss Position (Details) - USD ($) $ in Thousands | Mar. 31, 2020 | Dec. 31, 2019
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Available-for-sale securities in continuous loss position, less than 12 months, fair value | $ 13,937 | $ 7,724
Available-for-sale securities in continuous loss position, less than 12 months, unrealized loss | (521) | (62)
Available-for-sale securities in continuous loss position, 12 months or more, fair value | 13,341 | 17,081
Available-for-sale securities in continuous loss position, 12 months or more, unrealized loss | (2,261) | (886)
Available-for-sale securities in continuous loss position, fair value | 27,278 | 24,805
Available-for-sale securities in continuous loss position, unrealized loss | (2,782) | (948)
Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member] |  |
Available-for-sale securities in continuous loss position, less than 12 months, fair value | 107 | 2,609
Available-for-sale securities in continuous loss position, less than 12 months, unrealized loss | (4) | (20)
Available-for-sale securities in continuous loss position, 12 months or more, fair value | 1,585 | 3,919
Available-for-sale securities in continuous loss position, 12 months or more, unrealized loss | (17) | (48)
Available-for-sale securities in continuous loss position, fair value | 1,692 | 6,528
Available-for-sale securities in continuous loss position, unrealized loss | (21) | (68)
Corporate Debt Securities [Member] |  |
Available-for-sale securities in continuous loss position, less than 12 months, fair value | 3,739 |
Available-for-sale securities in continuous loss position, less than 12 months, unrealized loss | (278) |
Available-for-sale securities in continuous loss position, 12 months or more, fair value | 11,756 | 13,162
Available-for-sale securities in continuous loss position, 12 months or more, unrealized loss | (2,244) | (838)
Available-for-sale securities in continuous loss position, fair value | 15,495 | 13,162
Available-for-sale securities in continuous loss position, unrealized loss | (2,522) | (838)
Subordinated Notes [Member] |  |
Available-for-sale securities in continuous loss position, less than 12 months, fair value | 5,321 |
Available-for-sale securities in continuous loss position, less than 12 months, unrealized loss | (204) |
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 | 5,321 |
Available-for-sale securities in continuous loss position, unrealized loss | (204) |
SBA Loan Pools [Member] |  |
Available-for-sale securities in continuous loss position, less than 12 months, fair value | 4,770 | 5,115
Available-for-sale securities in continuous loss position, less than 12 months, unrealized loss | (35) | (42)
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 | 4,770 | 5,115
Available-for-sale securities in continuous loss position, unrealized loss | $ (35) | $ (42)

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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=121582814&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=121645371&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=121590138&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=121645371&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=121582814&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=121645371&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=121582814&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=121590138&loc=SL82922954-210456 + Details
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