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Note 3 - Fair Value Measurements - Financial Assets and Liabilities Measured at Fair Value on a Recurring Basis (Details) - USD ($) $ in Thousands | Sep. 30, 2023 | Dec. 31, 2022
--- | --- | ---
Debt Securities, Available-for-sale | $ 591,907 | $ 515,064
Equity securities, at fair value (cost: $43,002 in 2023; $42,352 in 2022) | 39,835 | 38,576
Fair Value, Recurring [Member] |  |
Equity securities, at fair value (cost: $43,002 in 2023; $42,352 in 2022) | 39,835 | 38,576
Cash, cash equivalents, and restricted cash | 53,288 | 68,164
Total assets | 685,030 | 621,804
Fair Value, Inputs, Level 1 [Member] | Fair Value, Recurring [Member] |  |
Equity securities, at fair value (cost: $43,002 in 2023; $42,352 in 2022) | 39,835 | 38,576
Cash, cash equivalents, and restricted cash | 53,288 | 68,164
Total assets | 93,123 | 106,740
Fair Value, Inputs, Level 2 [Member] | Fair Value, Recurring [Member] |  |
Equity securities, at fair value (cost: $43,002 in 2023; $42,352 in 2022) | 0 | 0
Cash, cash equivalents, and restricted cash | 0 | 0
Total assets | 591,907 | 515,064
Fair Value, Inputs, Level 3 [Member] | Fair Value, Recurring [Member] |  |
Equity securities, at fair value (cost: $43,002 in 2023; $42,352 in 2022) | 0 | 0
Cash, cash equivalents, and restricted cash | 0 | 0
Total assets | 0 | 0
US Government Agencies Debt Securities [Member] |  |
Debt Securities, Available-for-sale | 42,690 | 48,551
US Government Agencies Debt Securities [Member] | Fair Value, Recurring [Member] |  |
Debt Securities, Available-for-sale | 42,690 | 48,551
US Government Agencies Debt Securities [Member] | Fair Value, Inputs, Level 1 [Member] | Fair Value, Recurring [Member] |  |
Debt Securities, Available-for-sale | 0 | 0
US Government Agencies Debt Securities [Member] | Fair Value, Inputs, Level 2 [Member] | Fair Value, Recurring [Member] |  |
Debt Securities, Available-for-sale | 42,690 | 48,551
US Government Agencies Debt Securities [Member] | Fair Value, Inputs, Level 3 [Member] | Fair Value, Recurring [Member] |  |
Debt Securities, Available-for-sale | 0 | 0
States Territories Possessions Debt Securities [Member] |  |
Debt Securities, Available-for-sale | 5,213 | 5,354
States Territories Possessions Debt Securities [Member] | Fair Value, Recurring [Member] |  |
Debt Securities, Available-for-sale | 5,213 | 5,354
States Territories Possessions Debt Securities [Member] | Fair Value, Inputs, Level 1 [Member] | Fair Value, Recurring [Member] |  |
Debt Securities, Available-for-sale | 0 | 0
States Territories Possessions Debt Securities [Member] | Fair Value, Inputs, Level 2 [Member] | Fair Value, Recurring [Member] |  |
Debt Securities, Available-for-sale | 5,213 | 5,354
States Territories Possessions Debt Securities [Member] | Fair Value, Inputs, Level 3 [Member] | Fair Value, Recurring [Member] |  |
Debt Securities, Available-for-sale | 0 | 0
Political Subdivisions Debt Securities [Member] |  |
Debt Securities, Available-for-sale | 3,848 | 4,298
Political Subdivisions Debt Securities [Member] | Fair Value, Recurring [Member] |  |
Debt Securities, Available-for-sale | 3,848 | 4,298
Political Subdivisions Debt Securities [Member] | Fair Value, Inputs, Level 1 [Member] | Fair Value, Recurring [Member] |  |
Debt Securities, Available-for-sale | 0 | 0
Political Subdivisions Debt Securities [Member] | Fair Value, Inputs, Level 2 [Member] | Fair Value, Recurring [Member] |  |
Debt Securities, Available-for-sale | 3,848 | 4,298
Political Subdivisions Debt Securities [Member] | Fair Value, Inputs, Level 3 [Member] | Fair Value, Recurring [Member] |  |
Debt Securities, Available-for-sale | 0 | 0
Special Revenue Excluding Asset Backed Securities [Member] |  |
Debt Securities, Available-for-sale | 27,868 | 32,799
Special Revenue Excluding Asset Backed Securities [Member] | Fair Value, Recurring [Member] |  |
Debt Securities, Available-for-sale | 27,868 | 32,799
Special Revenue Excluding Asset Backed Securities [Member] | Fair Value, Inputs, Level 1 [Member] | Fair Value, Recurring [Member] |  |
Debt Securities, Available-for-sale | 0 | 0
Special Revenue Excluding Asset Backed Securities [Member] | Fair Value, Inputs, Level 2 [Member] | Fair Value, Recurring [Member] |  |
Debt Securities, Available-for-sale | 27,868 | 32,799
Special Revenue Excluding Asset Backed Securities [Member] | Fair Value, Inputs, Level 3 [Member] | Fair Value, Recurring [Member] |  |
Debt Securities, Available-for-sale | 0 | 0
Corporate Debt Securities and Other Debt Obligations [Member] |  |
Debt Securities, Available-for-sale | 276,933 | 254,095
Corporate Debt Securities and Other Debt Obligations [Member] | Fair Value, Recurring [Member] |  |
Debt Securities, Available-for-sale | 276,933 | 254,095
Corporate Debt Securities and Other Debt Obligations [Member] | Fair Value, Inputs, Level 1 [Member] | Fair Value, Recurring [Member] |  |
Debt Securities, Available-for-sale | 0 | 0
Corporate Debt Securities and Other Debt Obligations [Member] | Fair Value, Inputs, Level 2 [Member] | Fair Value, Recurring [Member] |  |
Debt Securities, Available-for-sale | 276,933 | 254,095
Corporate Debt Securities and Other Debt Obligations [Member] | Fair Value, Inputs, Level 3 [Member] | Fair Value, Recurring [Member] |  |
Debt Securities, Available-for-sale | 0 | 0
Asset-Backed Securities [Member] |  |
Debt Securities, Available-for-sale | 235,355 | 169,967
Asset-Backed Securities [Member] | Fair Value, Recurring [Member] |  |
Debt Securities, Available-for-sale | 235,355 | 169,967
Asset-Backed Securities [Member] | Fair Value, Inputs, Level 1 [Member] | Fair Value, Recurring [Member] |  |
Debt Securities, Available-for-sale | 0 | 0
Asset-Backed Securities [Member] | Fair Value, Inputs, Level 2 [Member] | Fair Value, Recurring [Member] |  |
Debt Securities, Available-for-sale | 235,355 | 169,967
Asset-Backed Securities [Member] | Fair Value, Inputs, Level 3 [Member] | Fair Value, Recurring [Member] |  |
Debt Securities, Available-for-sale | $ 0 | $ 0

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