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Note 7 - Fair Value - Financial Assets At Fair Value (Details) - USD ($) $ in Thousands | Jun. 30, 2025 | Mar. 31, 2025 | Dec. 31, 2024
--- | --- | --- | ---
Securities | $ 436,965 |  | $ 360,530
US States and Political Subdivisions Debt Securities [Member] |  |  |
Securities | 706 |  | 706
US Treasury and Government [Member] |  |  |
Securities | 432,733 |  | 246,290
Residential Mortgage-Backed Securities [Member] |  |  |
Securities | 2,736 |  | 2,911
Collateralized Mortgage-Backed Securities [Member] |  |  |
Securities | 790 |  | 850
US Government-sponsored Enterprises Debt Securities [Member] |  |  |
Securities |  | $ 109,773 |
Fair Value, Inputs, Level 1 [Member] |  |  |
Securities | 432,733 |  | 246,290
Fair Value, Inputs, Level 1 [Member] | US States and Political Subdivisions Debt Securities [Member] |  |  |
Securities | 0 |  | 0
Fair Value, Inputs, Level 1 [Member] | US Treasury and Government [Member] |  |  |
Securities | 432,733 |  | 246,290
Fair Value, Inputs, Level 1 [Member] | Residential Mortgage-Backed Securities [Member] |  |  |
Securities | 0 |  | 0
Fair Value, Inputs, Level 1 [Member] | Collateralized Mortgage-Backed Securities [Member] |  |  |
Securities | 0 |  | 0
Fair Value, Inputs, Level 1 [Member] | US Government-sponsored Enterprises Debt Securities [Member] |  |  |
Securities |  | 0 |
Fair Value, Inputs, Level 2 [Member] |  |  |
Securities | 4,232 |  | 114,240
Fair Value, Inputs, Level 2 [Member] | US States and Political Subdivisions Debt Securities [Member] |  |  |
Securities | 706 |  | 706
Fair Value, Inputs, Level 2 [Member] | US Treasury and Government [Member] |  |  |
Securities | 0 |  | 0
Fair Value, Inputs, Level 2 [Member] | Residential Mortgage-Backed Securities [Member] |  |  |
Securities | 2,736 |  | 2,911
Fair Value, Inputs, Level 2 [Member] | Collateralized Mortgage-Backed Securities [Member] |  |  |
Securities | 790 |  | 850
Fair Value, Inputs, Level 2 [Member] | US Government-sponsored Enterprises Debt Securities [Member] |  |  |
Securities |  | 109,773 |
Fair Value, Inputs, Level 3 [Member] |  |  |
Securities | 0 |  | 0
Fair Value, Inputs, Level 3 [Member] | US States and Political Subdivisions Debt Securities [Member] |  |  |
Securities | 0 |  | 0
Fair Value, Inputs, Level 3 [Member] | US Treasury and Government [Member] |  |  |
Securities | 0 |  | 0
Fair Value, Inputs, Level 3 [Member] | Residential Mortgage-Backed Securities [Member] |  |  |
Securities | 0 |  | 0
Fair Value, Inputs, Level 3 [Member] | Collateralized Mortgage-Backed Securities [Member] |  |  |
Securities | $ 0 |  | $ 0
Fair Value, Inputs, Level 3 [Member] | US Government-sponsored Enterprises Debt Securities [Member] |  |  |
Securities |  | $ 0 |

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- Definition Amount excluding accrued interest, 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/2009/role/commonPracticeRef -Topic 326 -SubTopic 30 -Name Accounting Standards Codification -Section 45 -Paragraph 1 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479130/326-30-45-1 + Details
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