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Note 5 - Financial Instruments and Fair Value Measurements - Measured on Recurring and Non Recurring Basis (Details) - USD ($) | Sep. 30, 2024 | Dec. 31, 2023
--- | --- | ---
Available-for-sale securities, fair market value | $ 517,332,000 | $ 518,078,000
Equity Securities | 3,274,000 | 3,132,000
US Government Agencies Debt Securities [Member] |  |
Available-for-sale securities, fair market value | 93,982,000 | 80,259,000
US Government Agencies Debt Securities [Member] | Fair Value, Recurring [Member] |  |
Available-for-sale securities, fair market value | 93,982,000 | 80,259,000
US Government Agencies Debt Securities [Member] | Fair Value, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] |  |
Available-for-sale securities, fair market value | 0 | 0
US Government Agencies Debt Securities [Member] | Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] |  |
Available-for-sale securities, fair market value | 93,982,000 | 80,259,000
US Government Agencies Debt Securities [Member] | Fair Value, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] |  |
Available-for-sale securities, fair market value | 0 | 0
Collateralized Mortgage Obligations [Member] |  |
Available-for-sale securities, fair market value | 26,098,000 | 8,664,000
Collateralized Mortgage Obligations [Member] | Fair Value, Recurring [Member] |  |
Available-for-sale securities, fair market value | 26,098,000 | 8,664,000
Collateralized Mortgage Obligations [Member] | Fair Value, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] |  |
Available-for-sale securities, fair market value |  | 0
Collateralized Mortgage Obligations [Member] | Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] |  |
Available-for-sale securities, fair market value | 26,098,000 | 8,664,000
Collateralized Mortgage Obligations [Member] | Fair Value, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] |  |
Available-for-sale securities, fair market value |  | 0
US States and Political Subdivisions Debt Securities [Member] |  |
Available-for-sale securities, fair market value | 306,212,000 | 328,908,000
US States and Political Subdivisions Debt Securities [Member] | Fair Value, Recurring [Member] |  |
Available-for-sale securities, fair market value | 306,212,000 | 328,908,000
US States and Political Subdivisions Debt Securities [Member] | Fair Value, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] |  |
Available-for-sale securities, fair market value |  | 0
US States and Political Subdivisions Debt Securities [Member] | Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] |  |
Available-for-sale securities, fair market value | 306,212,000 | 328,908,000
US States and Political Subdivisions Debt Securities [Member] | Fair Value, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] |  |
Available-for-sale securities, fair market value |  | 0
SBA Pool [Member] |  |
Available-for-sale securities, fair market value | 940,000 | 1,395,000
SBA Pool [Member] | Fair Value, Recurring [Member] |  |
Available-for-sale securities, fair market value | 940,000 | 1,395,000
SBA Pool [Member] | Fair Value, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] |  |
Available-for-sale securities, fair market value |  | 0
SBA Pool [Member] | Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] |  |
Available-for-sale securities, fair market value | 940,000 | 1,395,000
SBA Pool [Member] | Fair Value, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] |  |
Available-for-sale securities, fair market value |  | 0
Corporate Debt Securities [Member] |  |
Available-for-sale securities, fair market value | 41,033,000 | 43,517,000
Corporate Debt Securities [Member] | Fair Value, Recurring [Member] |  |
Available-for-sale securities, fair market value | 41,033,000 | 43,517,000
Corporate Debt Securities [Member] | Fair Value, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] |  |
Available-for-sale securities, fair market value |  | 0
Corporate Debt Securities [Member] | Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] |  |
Available-for-sale securities, fair market value | 41,033,000 | 43,517,000
Corporate Debt Securities [Member] | Fair Value, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] |  |
Available-for-sale securities, fair market value |  | 0
Asset-Backed Securities [Member] |  |
Available-for-sale securities, fair market value | 49,067,000 | 55,335,000
Asset-Backed Securities [Member] | Fair Value, Recurring [Member] |  |
Available-for-sale securities, fair market value | 49,067,000 | 55,335,000
Asset-Backed Securities [Member] | Fair Value, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] |  |
Available-for-sale securities, fair market value |  | 0
Asset-Backed Securities [Member] | Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] |  |
Available-for-sale securities, fair market value | 49,067,000 | 55,335,000
Asset-Backed Securities [Member] | Fair Value, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] |  |
Available-for-sale securities, fair market value |  | 0
Mutual Fund [Member] | Fair Value, Recurring [Member] |  |
Equity Securities | 3,274,000 | 3,132,000
Mutual Fund [Member] | Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] |  |
Equity Securities | $ 0 | 0
Mutual Fund [Member] | Fair Value, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] |  |
Equity Securities |  | $ 0

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