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Note 3 - Securities - Fair Value of Securities (Details) - USD ($) $ in Thousands | Dec. 31, 2022 | Dec. 31, 2021
--- | --- | ---
Amortized cost | $ 218,599 | $ 85,585
Gross unrealized gains | 27 | 185
Gross unrealized losses | (8,288) | (76)
Fair value | 210,338 | 85,694
Certificates of Deposit [Member] |  |
Amortized cost | 2,233 | 2,728
Gross unrealized gains | 0 | 0
Gross unrealized losses | 0 | 0
Fair value | 2,233 | 2,728
US States and Political Subdivisions Debt Securities [Member] |  |
Amortized cost | 240 |
Gross unrealized gains | 0 |
Gross unrealized losses | (15) |
Fair value | 225 |
US Treasury Securities [Member] |  |
Amortized cost | 170,906 | 76,621
Gross unrealized gains | 0 | 8
Gross unrealized losses | (7,803) | (76)
Fair value | 163,103 | 76,553
US Government-sponsored Enterprises Debt Securities [Member] |  |
Amortized cost | 40,000 |
Gross unrealized gains | 0 |
Gross unrealized losses | (301) |
Fair value | 39,699 |
Residential Mortgage-Backed Securities [Member] |  |
Amortized cost | 3,997 | 4,660
Gross unrealized gains | 27 | 173
Gross unrealized losses | (143) | 0
Fair value | 3,881 | 4,833
Collateralized Mortgage-Backed Securities [Member] |  |
Amortized cost | 1,223 | 1,576
Gross unrealized gains | 0 | 4
Gross unrealized losses | (26) | 0
Fair value | $ 1,197 | $ 1,580

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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 https://asc.fasb.org/extlink&oid=126970911&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 https://asc.fasb.org/extlink&oid=126970911&loc=d3e27161-111563 + Details
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