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Note 4 - Fair Value Measurements - Assets Measured at Fair Value on a Recurring Basis (Details) - USD ($) $ in Thousands | Sep. 30, 2025 | Dec. 31, 2024
--- | --- | ---
Available for sale securities | $ 650,660 | $ 648,513
US Treasury Securities [Member] |  |
Available for sale securities | 152,869 | 167,715
US Government Agencies Debt Securities [Member] |  |
Available for sale securities | 89,933 | 83,433
Mortgage-Backed Security, Issued by US Government-Sponsored Enterprise [Member] |  |
Available for sale securities | 110,482 | 91,050
US States and Political Subdivisions Debt Securities [Member] |  |
Available for sale securities | 236,285 | 245,562
Corporate Debt Securities [Member] |  |
Available for sale securities | 61,091 | 60,753
Fair Value, Recurring [Member] |  |
Loans receivable | 7,950 | 7,923
Derivative financial instruments | 815 | 996
Derivative financial instruments, liabilities | 409 | 248
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] |  |
Loans receivable | 0 | 0
Derivative financial instruments | 0 | 0
Derivative financial instruments, liabilities | 0 | 0
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] |  |
Loans receivable | 7,950 | 7,923
Derivative financial instruments | 815 | 996
Derivative financial instruments, liabilities | 409 | 248
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] |  |
Loans receivable | 0 | 0
Derivative financial instruments | 0 | 0
Derivative financial instruments, liabilities | 0 | 0
Fair Value, Recurring [Member] | US Treasury Securities [Member] |  |
Available for sale securities | 152,869 | 167,715
Fair Value, Recurring [Member] | US Treasury Securities [Member] | Fair Value, Inputs, Level 1 [Member] |  |
Available for sale securities | 152,869 | 167,715
Fair Value, Recurring [Member] | US Treasury Securities [Member] | Fair Value, Inputs, Level 2 [Member] |  |
Available for sale securities | 0 | 0
Fair Value, Recurring [Member] | US Treasury Securities [Member] | Fair Value, Inputs, Level 3 [Member] |  |
Available for sale securities | 0 | 0
Fair Value, Recurring [Member] | US Government Agencies Debt Securities [Member] |  |
Available for sale securities | 89,933 | 83,433
Fair Value, Recurring [Member] | US Government Agencies Debt Securities [Member] | Fair Value, Inputs, Level 1 [Member] |  |
Available for sale securities | 0 | 0
Fair Value, Recurring [Member] | US Government Agencies Debt Securities [Member] | Fair Value, Inputs, Level 2 [Member] |  |
Available for sale securities | 89,933 | 83,433
Fair Value, Recurring [Member] | US Government Agencies Debt Securities [Member] | Fair Value, Inputs, Level 3 [Member] |  |
Available for sale securities | 0 | 0
Fair Value, Recurring [Member] | Mortgage-Backed Security, Issued by US Government-Sponsored Enterprise [Member] |  |
Available for sale securities | 110,482 | 91,050
Fair Value, Recurring [Member] | Mortgage-Backed Security, Issued by US Government-Sponsored Enterprise [Member] | Fair Value, Inputs, Level 1 [Member] |  |
Available for sale securities | 0 | 0
Fair Value, Recurring [Member] | Mortgage-Backed Security, Issued by US Government-Sponsored Enterprise [Member] | Fair Value, Inputs, Level 2 [Member] |  |
Available for sale securities | 110,482 | 91,050
Fair Value, Recurring [Member] | Mortgage-Backed Security, Issued by US Government-Sponsored Enterprise [Member] | Fair Value, Inputs, Level 3 [Member] |  |
Available for sale securities | 0 | 0
Fair Value, Recurring [Member] | US States and Political Subdivisions Debt Securities [Member] |  |
Available for sale securities | 236,285 | 245,562
Fair Value, Recurring [Member] | US States and Political Subdivisions Debt Securities [Member] | Fair Value, Inputs, Level 1 [Member] |  |
Available for sale securities | 0 | 0
Fair Value, Recurring [Member] | US States and Political Subdivisions Debt Securities [Member] | Fair Value, Inputs, Level 2 [Member] |  |
Available for sale securities | 236,285 | 245,562
Fair Value, Recurring [Member] | US States and Political Subdivisions Debt Securities [Member] | Fair Value, Inputs, Level 3 [Member] |  |
Available for sale securities | 0 | 0
Fair Value, Recurring [Member] | Corporate Debt Securities [Member] |  |
Available for sale securities | 61,091 | 60,753
Fair Value, Recurring [Member] | Corporate Debt Securities [Member] | Fair Value, Inputs, Level 1 [Member] |  |
Available for sale securities | 0 | 0
Fair Value, Recurring [Member] | Corporate Debt Securities [Member] | Fair Value, Inputs, Level 2 [Member] |  |
Available for sale securities | 61,091 | 60,753
Fair Value, Recurring [Member] | Corporate Debt Securities [Member] | Fair Value, Inputs, Level 3 [Member] |  |
Available for sale securities | $ 0 | $ 0

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