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Note 3 - Available-for-sale Securities - Investment Securities in a Continuous Loss Position (Details) - USD ($) $ in Thousands | Jun. 30, 2021 | Dec. 31, 2020
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Available-for-sale securities in continuous loss position, less than 12 months, fair value | $ 35,589 | $ 9,208
Available-for-sale securities in continuous loss position, less than 12 months, unrealized loss | (396) | (148)
Available-for-sale securities in continuous loss position, 12 months or more, fair value | 4,829 | 19,628
Available-for-sale securities in continuous loss position, 12 months or more, unrealized loss | (43) | (1,041)
Available-for-sale securities in continuous loss position, fair value | 40,418 | 28,836
Available-for-sale securities in continuous loss position, unrealized loss | (439) | (1,189)
Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member] |  |
Available-for-sale securities in continuous loss position, less than 12 months, fair value | 30,957 | 5,797
Available-for-sale securities in continuous loss position, less than 12 months, unrealized loss | (372) | (14)
Available-for-sale securities in continuous loss position, 12 months or more, fair value | 74 | 1,476
Available-for-sale securities in continuous loss position, 12 months or more, unrealized loss | (1) | (3)
Available-for-sale securities in continuous loss position, fair value | 31,031 | 7,273
Available-for-sale securities in continuous loss position, unrealized loss | (373) | (17)
Subordinated Notes [Member] |  |
Available-for-sale securities in continuous loss position, less than 12 months, fair value | 0 | 1,878
Available-for-sale securities in continuous loss position, less than 12 months, unrealized loss | 0 | (122)
Available-for-sale securities in continuous loss position, 12 months or more, fair value | 1,105 | 1,103
Available-for-sale securities in continuous loss position, 12 months or more, unrealized loss | (4) | (6)
Available-for-sale securities in continuous loss position, fair value | 1,105 | 2,981
Available-for-sale securities in continuous loss position, unrealized loss | (4) | (128)
SBA Loan Pools [Member] |  |
Available-for-sale securities in continuous loss position, less than 12 months, fair value | 4,225 | 1,533
Available-for-sale securities in continuous loss position, less than 12 months, unrealized loss | (23) | (12)
Available-for-sale securities in continuous loss position, 12 months or more, fair value | 3,650 | 4,034
Available-for-sale securities in continuous loss position, 12 months or more, unrealized loss | (38) | (48)
Available-for-sale securities in continuous loss position, fair value | 7,875 | 5,567
Available-for-sale securities in continuous loss position, unrealized loss | (61) | (60)
US States and Political Subdivisions Debt Securities [Member] |  |
Available-for-sale securities in continuous loss position, less than 12 months, fair value | 407 |
Available-for-sale securities in continuous loss position, less than 12 months, unrealized loss | (1) |
Available-for-sale securities in continuous loss position, 12 months or more, fair value | 0 |
Available-for-sale securities in continuous loss position, 12 months or more, unrealized loss | 0 |
Available-for-sale securities in continuous loss position, fair value | 407 |
Available-for-sale securities in continuous loss position, unrealized loss | $ (1) |
Corporate Debt Securities [Member] |  |
Available-for-sale securities in continuous loss position, less than 12 months, fair value |  | 0
Available-for-sale securities in continuous loss position, less than 12 months, unrealized loss |  | 0
Available-for-sale securities in continuous loss position, 12 months or more, fair value |  | 13,015
Available-for-sale securities in continuous loss position, 12 months or more, unrealized loss |  | (984)
Available-for-sale securities in continuous loss position, fair value |  | 13,015
Available-for-sale securities in continuous loss position, unrealized loss |  | $ (984)

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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=123581744&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=124269663&loc=SL82922890-210455 + Details
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