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Note 3 - Available-for-sale Securities - Investment Securities in a Continuous Loss Position (Details) - USD ($) $ in Thousands | Dec. 31, 2021 | Dec. 31, 2020
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Available-for-sale securities in continuous loss position, less than 12 months, fair value | $ 81,657 | $ 9,208
Available-for-sale securities in continuous loss position, less than 12 months, unrealized loss | (2,318) | (148)
Available-for-sale securities in continuous loss position, 12 months or more, fair value | 2,702 | 19,628
Available-for-sale securities in continuous loss position, 12 months or more, unrealized loss | (66) | (1,041)
Available-for-sale securities in continuous loss position, fair value | 84,359 | 28,836
Available-for-sale securities in continuous loss position, unrealized loss | (2,384) | (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 | 60,606 | 5,797
Available-for-sale securities in continuous loss position, less than 12 months, unrealized loss | (1,196) | (14)
Available-for-sale securities in continuous loss position, 12 months or more, fair value | 1,610 | 1,476
Available-for-sale securities in continuous loss position, 12 months or more, unrealized loss | (49) | (3)
Available-for-sale securities in continuous loss position, fair value | 62,216 | 7,273
Available-for-sale securities in continuous loss position, unrealized loss | (1,245) | (17)
Corporate Debt Securities [Member] |  |
Available-for-sale securities in continuous loss position, less than 12 months, fair value | 15,042 | 0
Available-for-sale securities in continuous loss position, less than 12 months, unrealized loss | (951) | 0
Available-for-sale securities in continuous loss position, 12 months or more, fair value | 0 | 13,015
Available-for-sale securities in continuous loss position, 12 months or more, unrealized loss | 0 | (984)
Available-for-sale securities in continuous loss position, fair value | 15,042 | 13,015
Available-for-sale securities in continuous loss position, unrealized loss | (951) | (984)
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 | 1,092 | 1,103
Available-for-sale securities in continuous loss position, 12 months or more, unrealized loss | (17) | (6)
Available-for-sale securities in continuous loss position, fair value | 1,092 | 2,981
Available-for-sale securities in continuous loss position, unrealized loss | (17) | (128)
SBA Loan Pools [Member] |  |
Available-for-sale securities in continuous loss position, less than 12 months, fair value | 5,603 | 1,533
Available-for-sale securities in continuous loss position, less than 12 months, unrealized loss | (169) | (12)
Available-for-sale securities in continuous loss position, 12 months or more, fair value | 0 | 4,034
Available-for-sale securities in continuous loss position, 12 months or more, unrealized loss | 0 | (48)
Available-for-sale securities in continuous loss position, fair value | 5,603 | 5,567
Available-for-sale securities in continuous loss position, unrealized loss | (169) | $ (60)
US States and Political Subdivisions Debt Securities [Member] |  |
Available-for-sale securities in continuous loss position, less than 12 months, fair value | 406 |
Available-for-sale securities in continuous loss position, less than 12 months, unrealized loss | (2) |
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 | 406 |
Available-for-sale securities in continuous loss position, unrealized loss | $ (2) |

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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=124269663&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=123581744&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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