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Note 3 - Securities - Fair Value of Securities (Details) - USD ($) $ in Thousands | Sep. 30, 2023 | Dec. 31, 2022
--- | --- | ---
Amortized cost | $ 163,972 | $ 218,599
Gross unrealized gains | 23 | 27
Gross unrealized losses | (5,570) | (8,288)
Fair value | 158,425 | 210,338
Certificates of Deposit [Member] |  |
Amortized cost | 2,725 | 2,233
Gross unrealized gains | 0 | 0
Gross unrealized losses | 0 | 0
Fair value | 2,725 | 2,233
US States and Political Subdivisions Debt Securities [Member] |  |
Amortized cost | 240 | 240
Gross unrealized gains | 0 | 0
Gross unrealized losses | (11) | (15)
Fair value | 229 | 225
US Treasury Securities [Member] |  |
Amortized cost | 128,326 | 170,906
Gross unrealized gains | 0 | 0
Gross unrealized losses | (5,231) | (7,803)
Fair value | 123,095 | 163,103
US Government-sponsored Enterprises Debt Securities [Member] |  |
Amortized cost | 28,000 | 40,000
Gross unrealized gains | 0 | 0
Gross unrealized losses | (137) | (301)
Fair value | 27,863 | 39,699
Residential Mortgage-Backed Securities [Member] |  |
Amortized cost | 3,622 | 3,997
Gross unrealized gains | 23 | 27
Gross unrealized losses | (165) | (143)
Fair value | 3,480 | 3,881
Collateralized Mortgage-Backed Securities [Member] |  |
Amortized cost | 1,059 | 1,223
Gross unrealized gains | 0 | 0
Gross unrealized losses | (26) | (26)
Fair value | $ 1,033 | $ 1,197

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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://www.xbrl.org/2003/role/disclosureRef -Topic 320 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org//1943274/2147481800/320-10-50-2 + 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://www.xbrl.org/2003/role/disclosureRef -Topic 320 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (c) -Publisher FASB -URI https://asc.fasb.org//1943274/2147481800/320-10-50-2 + Details
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