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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 | Mar. 31, 2024 | Dec. 31, 2023
--- | --- | ---
Debt Securities, Available-for-sale | $ 662,992 | $ 643,799
Equity securities | 37,171 | 43,160
US Government Agencies Debt Securities [Member] |  |
Debt Securities, Available-for-sale | 38,342 | 39,420
US States and Political Subdivisions Debt Securities [Member] |  |
Debt Securities, Available-for-sale | 9,884 | 9,902
Special Revenue Excluding Asset Backed Securities [Member] |  |
Debt Securities, Available-for-sale | 29,105 | 29,511
Corporate Debt Securities and Other Debt Obligations [Member] |  |
Debt Securities, Available-for-sale | 319,755 | 300,239
Asset-Backed Securities [Member] |  |
Debt Securities, Available-for-sale | 265,906 | 264,727
Fair Value, Recurring [Member] |  |
Equity securities | 37,171 | 43,160
Cash, cash equivalents, and restricted cash | 61,764 | 51,852
Total assets | 761,927 | 738,811
Fair Value, Recurring [Member] | US Government Agencies Debt Securities [Member] |  |
Debt Securities, Available-for-sale | 38,342 | 39,420
Fair Value, Recurring [Member] | US States and Political Subdivisions Debt Securities [Member] |  |
Debt Securities, Available-for-sale | 9,884 | 9,902
Fair Value, Recurring [Member] | Special Revenue Excluding Asset Backed Securities [Member] |  |
Debt Securities, Available-for-sale | 29,105 | 29,511
Fair Value, Recurring [Member] | Corporate Debt Securities and Other Debt Obligations [Member] |  |
Debt Securities, Available-for-sale | 319,755 | 300,239
Fair Value, Recurring [Member] | Asset-Backed Securities [Member] |  |
Debt Securities, Available-for-sale | 265,906 | 264,727
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] |  |
Equity securities | 37,171 | 43,160
Cash, cash equivalents, and restricted cash | 61,764 | 51,852
Total assets | 98,935 | 95,012
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] | US Government Agencies Debt Securities [Member] |  |
Debt Securities, Available-for-sale | 0 | 0
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] | US States and Political Subdivisions Debt Securities [Member] |  |
Debt Securities, Available-for-sale | 0 | 0
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] | Special Revenue Excluding Asset Backed Securities [Member] |  |
Debt Securities, Available-for-sale | 0 | 0
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] | Corporate Debt Securities and Other Debt Obligations [Member] |  |
Debt Securities, Available-for-sale | 0 | 0
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] | Asset-Backed Securities [Member] |  |
Debt Securities, Available-for-sale | 0 | 0
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] |  |
Equity securities | 0 | 0
Cash, cash equivalents, and restricted cash | 0 | 0
Total assets | 662,992 | 643,799
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | US Government Agencies Debt Securities [Member] |  |
Debt Securities, Available-for-sale | 38,342 | 39,420
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | US States and Political Subdivisions Debt Securities [Member] |  |
Debt Securities, Available-for-sale | 9,884 | 9,902
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | Special Revenue Excluding Asset Backed Securities [Member] |  |
Debt Securities, Available-for-sale | 29,105 | 29,511
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | Corporate Debt Securities and Other Debt Obligations [Member] |  |
Debt Securities, Available-for-sale | 319,755 | 300,239
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | Asset-Backed Securities [Member] |  |
Debt Securities, Available-for-sale | 265,906 | 264,727
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] |  |
Equity securities | 0 | 0
Cash, cash equivalents, and restricted cash | 0 | 0
Total assets | 0 | 0
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] | US Government Agencies Debt Securities [Member] |  |
Debt Securities, Available-for-sale | 0 | 0
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] | US States and Political Subdivisions Debt Securities [Member] |  |
Debt Securities, Available-for-sale | 0 | 0
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] | Special Revenue Excluding Asset Backed Securities [Member] |  |
Debt Securities, Available-for-sale | 0 | 0
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] | Corporate Debt Securities and Other Debt Obligations [Member] |  |
Debt Securities, Available-for-sale | 0 | 0
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] | Asset-Backed Securities [Member] |  |
Debt Securities, Available-for-sale | $ 0 | $ 0

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