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Note 3 - Securities - Fair Value of Securities (Details) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Amortized cost | $ 23,538 | $ 59,884
Gross unrealized gains | 292 | 322
Gross unrealized losses | (1) | (13)
Fair value | 23,829 | 60,193
Certificates of Deposit [Member] |  |
Amortized cost | 15,117 | 48,666
Gross unrealized gains | 0 | 0
Gross unrealized losses | 0 | 0
Fair value | 15,117 | 48,666
US States and Political Subdivisions Debt Securities [Member] |  |
Amortized cost | 402 | 505
Gross unrealized gains | 7 | 8
Gross unrealized losses | 0 | 0
Fair value | 409 | 513
Residential Mortgage Backed Securities [Member] |  |
Amortized cost | 5,826 | 7,727
Gross unrealized gains | 282 | 310
Gross unrealized losses | 0 | 0
Fair value | 6,108 | 8,037
Collateralized Mortgage Backed Securities [Member] |  |
Amortized cost | 2,193 | 2,986
Gross unrealized gains | 3 | 4
Gross unrealized losses | (1) | (13)
Fair value | $ 2,195 | $ 2,977

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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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