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Note 4 - Debt and Equity Securities - Securities Available-for-sale Continuous Unrealized Loss Position (Details) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Less than 12 months, estimated fair value | $ 19,522 | $ 63,376
Less than 12 months, unrealized losses | (73) | (268)
12 months or more, estimated fair value | 1,076 | 10,408
12 months or more, unrealized losses | (8) | (180)
Total estimated fair value | 20,598 | 73,784
Total unrealized losses | (81) | (448)
US Government Agencies Debt Securities [Member] |  |
Less than 12 months, estimated fair value | 6,016 | 23,827
Less than 12 months, unrealized losses | (7) | (85)
12 months or more, estimated fair value | 896 | 2,520
12 months or more, unrealized losses | (6) | (4)
Total estimated fair value | 6,912 | 26,347
Total unrealized losses | (13) | (89)
US Treasury Securities [Member] |  |
Less than 12 months, estimated fair value |  | 3,023
Less than 12 months, unrealized losses |  | (4)
12 months or more, estimated fair value |  | 0
12 months or more, unrealized losses |  | 0
Total estimated fair value |  | 3,023
Total unrealized losses |  | (4)
Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member] |  |
Less than 12 months, estimated fair value | 5,097 | 14,885
Less than 12 months, unrealized losses | (31) | (28)
12 months or more, estimated fair value | 0 | 1,934
12 months or more, unrealized losses | 0 | (6)
Total estimated fair value | 5,097 | 16,819
Total unrealized losses | (31) | (34)
US States and Political Subdivisions Debt Securities [Member] |  |
Less than 12 months, estimated fair value | 7,875 | 17,512
Less than 12 months, unrealized losses | (34) | (125)
12 months or more, estimated fair value | 180 | 5,954
12 months or more, unrealized losses | (2) | (170)
Total estimated fair value | 8,055 | 23,466
Total unrealized losses | (36) | (295)
Corporate Debt Securities [Member] |  |
Less than 12 months, estimated fair value | 534 | 4,129
Less than 12 months, unrealized losses | (1) | (26)
12 months or more, estimated fair value | 0 | 0
12 months or more, unrealized losses | 0 | 0
Total estimated fair value | 534 | 4,129
Total unrealized losses | $ (1) | $ (26)

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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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