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Note 3 - Debt Securities - Securities Available-for-sale (Details) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Securities available for sale, amortized cost | $ 81,958 | $ 168,478
Securities available for sale, unrealized gains | 1,501 | 1,266
Securities available for sale, unrealized losses | (101) | (170)
Securities available for sale, fair value | 83,358 | 169,574
US Government Agencies Debt Securities [Member] |  |
Securities available for sale, amortized cost | 555 | 5,038
Securities available for sale, unrealized gains | 0 | 0
Securities available for sale, unrealized losses | (4) | (4)
Securities available for sale, fair value | 551 | 5,034
US States and Political Subdivisions Debt Securities [Member] |  |
Securities available for sale, amortized cost | 43,950 | 85,992
Securities available for sale, unrealized gains | 509 | 886
Securities available for sale, unrealized losses | 0 | 0
Securities available for sale, fair value | 44,459 | 86,878
Mortgage-backed Agency Securities [Member] |  |
Securities available for sale, amortized cost | 37,453 | 77,448
Securities available for sale, unrealized gains | 992 | 380
Securities available for sale, unrealized losses | (97) | (166)
Securities available for sale, fair value | $ 38,348 | $ 77,662

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- Definition Amount, before tax, of unrealized gain in accumulated other comprehensive income (AOCI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=121645371&loc=d3e27161-111563 + Details
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- Definition Amount, before tax, of unrealized loss in accumulated other comprehensive income (AOCI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=121645371&loc=d3e27161-111563 + Details
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- Definition Amortized cost of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=121645371&loc=d3e27161-111563 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 30 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=121558606&loc=SL82898722-210454 + Details
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