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Note 6 - Fair Value Measurements - Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis (Details) - USD ($) $ in Thousands | Jun. 30, 2026 | Dec. 31, 2025
--- | --- | ---
Debt Securities, Available-for-Sale, Excluding Accrued Interest | $ 618,931 | $ 617,243
Fair Value, Recurring [Member] |  |
Debt Securities, Available-for-Sale, Excluding Accrued Interest | 618,931 | 617,243
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] |  |
Debt Securities, Available-for-Sale, Excluding Accrued Interest | 87,649 | 87,556
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] |  |
Debt Securities, Available-for-Sale, Excluding Accrued Interest | 531,282 | 529,687
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] |  |
Debt Securities, Available-for-Sale, Excluding Accrued Interest | 0 | 0
Fair Value, Recurring [Member] | US Treasury Securities [Member] |  |
Debt Securities, Available-for-Sale, Excluding Accrued Interest | 87,649 | 87,556
Fair Value, Recurring [Member] | US Treasury Securities [Member] | Fair Value, Inputs, Level 1 [Member] |  |
Debt Securities, Available-for-Sale, Excluding Accrued Interest | 87,649 | 87,556
Fair Value, Recurring [Member] | US Treasury Securities [Member] | Fair Value, Inputs, Level 2 [Member] |  |
Debt Securities, Available-for-Sale, Excluding Accrued Interest | 0 | 0
Fair Value, Recurring [Member] | US Treasury Securities [Member] | Fair Value, Inputs, Level 3 [Member] |  |
Debt Securities, Available-for-Sale, Excluding Accrued Interest | 0 | 0
Fair Value, Recurring [Member] | US Government Corporations and Agencies Securities [Member] |  |
Debt Securities, Available-for-Sale, Excluding Accrued Interest | 89,601 | 85,344
Fair Value, Recurring [Member] | US Government Corporations and Agencies Securities [Member] | Fair Value, Inputs, Level 1 [Member] |  |
Debt Securities, Available-for-Sale, Excluding Accrued Interest | 0 | 0
Fair Value, Recurring [Member] | US Government Corporations and Agencies Securities [Member] | Fair Value, Inputs, Level 2 [Member] |  |
Debt Securities, Available-for-Sale, Excluding Accrued Interest | 89,601 | 85,344
Fair Value, Recurring [Member] | US Government Corporations and Agencies Securities [Member] | Fair Value, Inputs, Level 3 [Member] |  |
Debt Securities, Available-for-Sale, Excluding Accrued Interest | 0 | 0
Fair Value, Recurring [Member] | US States and Political Subdivisions Debt Securities [Member] |  |
Debt Securities, Available-for-Sale, Excluding Accrued Interest | 73,908 | 75,003
Fair Value, Recurring [Member] | US States and Political Subdivisions Debt Securities [Member] | Fair Value, Inputs, Level 1 [Member] |  |
Debt Securities, Available-for-Sale, Excluding Accrued Interest | 0 | 0
Fair Value, Recurring [Member] | US States and Political Subdivisions Debt Securities [Member] | Fair Value, Inputs, Level 2 [Member] |  |
Debt Securities, Available-for-Sale, Excluding Accrued Interest | 73,908 | 75,003
Fair Value, Recurring [Member] | US States and Political Subdivisions Debt Securities [Member] | Fair Value, Inputs, Level 3 [Member] |  |
Debt Securities, Available-for-Sale, Excluding Accrued Interest | 0 | 0
Fair Value, Recurring [Member] | Collateralized Mortgage Obligations [Member] |  |
Debt Securities, Available-for-Sale, Excluding Accrued Interest | 96,060 | 92,284
Fair Value, Recurring [Member] | Collateralized Mortgage Obligations [Member] | Fair Value, Inputs, Level 1 [Member] |  |
Debt Securities, Available-for-Sale, Excluding Accrued Interest | 0 | 0
Fair Value, Recurring [Member] | Collateralized Mortgage Obligations [Member] | Fair Value, Inputs, Level 2 [Member] |  |
Debt Securities, Available-for-Sale, Excluding Accrued Interest | 96,060 | 92,284
Fair Value, Recurring [Member] | Collateralized Mortgage Obligations [Member] | Fair Value, Inputs, Level 3 [Member] |  |
Debt Securities, Available-for-Sale, Excluding Accrued Interest | 0 | 0
Fair Value, Recurring [Member] | Mortgage-Backed Security, Issued by US Government-Sponsored Enterprise [Member] |  |
Debt Securities, Available-for-Sale, Excluding Accrued Interest | 271,713 | 277,056
Fair Value, Recurring [Member] | Mortgage-Backed Security, Issued by US Government-Sponsored Enterprise [Member] | Fair Value, Inputs, Level 1 [Member] |  |
Debt Securities, Available-for-Sale, Excluding Accrued Interest | 0 | 0
Fair Value, Recurring [Member] | Mortgage-Backed Security, Issued by US Government-Sponsored Enterprise [Member] | Fair Value, Inputs, Level 2 [Member] |  |
Debt Securities, Available-for-Sale, Excluding Accrued Interest | 271,713 | 277,056
Fair Value, Recurring [Member] | Mortgage-Backed Security, Issued by US Government-Sponsored Enterprise [Member] | Fair Value, Inputs, Level 3 [Member] |  |
Debt Securities, Available-for-Sale, Excluding Accrued Interest | $ 0 | $ 0

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