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Note 3 - Securities - Securities Available-for-sale With Unrealized Losses (Details) - USD ($) $ in Thousands | Mar. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Less than 12 Months - Fair Value |  | $ 10,545
Less than 12 Months - Unrealized Loss |  | (44)
12 Months or More - Fair Value | 65,576 | 71,298
12 Months or More - Unrealized Loss | (1,186) | (2,759)
Fair Value | 65,576 | 81,843
Unrealized Loss | (1,186) | (2,803)
US Government-sponsored Enterprises Debt Securities [Member] |  |
Less than 12 Months - Fair Value |  | 1,981
Less than 12 Months - Unrealized Loss |  | (1)
12 Months or More - Fair Value | 5,935 | 8,679
12 Months or More - Unrealized Loss | (79) | (214)
Fair Value | 5,935 | 10,660
Unrealized Loss | (79) | (215)
Mortgage-backed Securities, Issued by Private Enterprises [Member] |  |
Less than 12 Months - Fair Value |  | 8,564
Less than 12 Months - Unrealized Loss |  | (43)
12 Months or More - Fair Value | 59,641 | 62,619
12 Months or More - Unrealized Loss | (1,107) | (2,545)
Fair Value | 59,641 | 71,183
Unrealized Loss | $ (1,107) | $ (2,588)

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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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