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Note 3 - Available-for-sale Securities - Investment Securities in a Continuous Loss Position (Details) - USD ($) $ in Thousands | Mar. 31, 2021 | Dec. 31, 2020
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Available-for-sale securities in continuous loss position, less than 12 months, fair value | $ 19,915 | $ 9,208
Available-for-sale securities in continuous loss position, less than 12 months, unrealized loss | (421) | (148)
Available-for-sale securities in continuous loss position, 12 months or more, fair value | 17,935 | 19,628
Available-for-sale securities in continuous loss position, 12 months or more, unrealized loss | (1,002) | (1,041)
Available-for-sale securities in continuous loss position, fair value | 37,850 | 28,836
Available-for-sale securities in continuous loss position, unrealized loss | (1,423) | (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 | 14,055 | 5,797
Available-for-sale securities in continuous loss position, less than 12 months, unrealized loss | (288) | (14)
Available-for-sale securities in continuous loss position, 12 months or more, fair value | 77 | 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 | 14,132 | 7,273
Available-for-sale securities in continuous loss position, unrealized loss | (289) | (17)
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 | 13,047 | 13,015
Available-for-sale securities in continuous loss position, 12 months or more, unrealized loss | (952) | (984)
Available-for-sale securities in continuous loss position, fair value | 13,047 | 13,015
Available-for-sale securities in continuous loss position, unrealized loss | (952) | (984)
Subordinated Notes [Member] |  |
Available-for-sale securities in continuous loss position, less than 12 months, fair value | 999 | 1,878
Available-for-sale securities in continuous loss position, less than 12 months, unrealized loss | (1) | (122)
Available-for-sale securities in continuous loss position, 12 months or more, fair value | 1,104 | 1,103
Available-for-sale securities in continuous loss position, 12 months or more, unrealized loss | (5) | (6)
Available-for-sale securities in continuous loss position, fair value | 2,103 | 2,981
Available-for-sale securities in continuous loss position, unrealized loss | (6) | (128)
SBA Loan Pools [Member] |  |
Available-for-sale securities in continuous loss position, less than 12 months, fair value | 4,458 | 1,533
Available-for-sale securities in continuous loss position, less than 12 months, unrealized loss | (127) | (12)
Available-for-sale securities in continuous loss position, 12 months or more, fair value | 3,707 | 4,034
Available-for-sale securities in continuous loss position, 12 months or more, unrealized loss | (44) | (48)
Available-for-sale securities in continuous loss position, fair value | 8,165 | 5,567
Available-for-sale securities in continuous loss position, unrealized loss | (171) | $ (60)
US States and Political Subdivisions Debt Securities [Member] |  |
Available-for-sale securities in continuous loss position, less than 12 months, fair value | 403 |
Available-for-sale securities in continuous loss position, less than 12 months, unrealized loss | (5) |
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 | 403 |
Available-for-sale securities in continuous loss position, unrealized loss | $ (5) |

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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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