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Note 2 - Investments - Summary of Available for Sale Investments (Details) - USD ($) $ in Thousands | Sep. 30, 2025 | Dec. 31, 2024
--- | --- | ---
Debt Securities, Available-for-Sale [Line Items] |  |
Available-for-Sale, Amortized Cost | $ 1,146,855 | $ 973,330
Available-for-sale, Accumulated Gross Unrealized Gain | 15,517 | 3,217
Available-for-sale, Accumulated Gross Unrealized Loss | (21,005) | (37,257)
Available-for-Sale, Allowance for Credit Loss | 0 | (244)
Fixed maturity securities available for sale, at fair value (amortized cost: $1,146,855 in 2025; $973,330 in 2024) | 1,141,367 | 939,046
US Government Agencies Debt Securities [Member] |  |
Debt Securities, Available-for-Sale [Line Items] |  |
Available-for-Sale, Amortized Cost | 24,831 | 33,449
Available-for-sale, Accumulated Gross Unrealized Gain | 85 | 6
Available-for-sale, Accumulated Gross Unrealized Loss | (279) | (649)
Available-for-Sale, Allowance for Credit Loss | 0 | 0
Fixed maturity securities available for sale, at fair value (amortized cost: $1,146,855 in 2025; $973,330 in 2024) | 24,637 | 32,806
US States and Political Subdivisions Debt Securities [Member] |  |
Debt Securities, Available-for-Sale [Line Items] |  |
Available-for-Sale, Amortized Cost | 19,789 | 10,606
Available-for-sale, Accumulated Gross Unrealized Gain | 104 | 29
Available-for-sale, Accumulated Gross Unrealized Loss | (1,178) | (857)
Available-for-Sale, Allowance for Credit Loss | 0 | 0
Fixed maturity securities available for sale, at fair value (amortized cost: $1,146,855 in 2025; $973,330 in 2024) | 18,715 | 9,778
Special Revenue Excluding Asset Backed Securities [Member] |  |
Debt Securities, Available-for-Sale [Line Items] |  |
Available-for-Sale, Amortized Cost | 19,292 | 30,283
Available-for-sale, Accumulated Gross Unrealized Gain | 36 | 85
Available-for-sale, Accumulated Gross Unrealized Loss | (2,125) | (3,734)
Available-for-Sale, Allowance for Credit Loss | 0 | 0
Fixed maturity securities available for sale, at fair value (amortized cost: $1,146,855 in 2025; $973,330 in 2024) | 17,203 | 26,634
Corporate Debt Securities and Other Debt Obligations [Member] |  |
Debt Securities, Available-for-Sale [Line Items] |  |
Available-for-Sale, Amortized Cost | 601,329 | 492,395
Available-for-sale, Accumulated Gross Unrealized Gain | 10,080 | 1,689
Available-for-sale, Accumulated Gross Unrealized Loss | (8,526) | (18,349)
Available-for-Sale, Allowance for Credit Loss | 0 | (244)
Fixed maturity securities available for sale, at fair value (amortized cost: $1,146,855 in 2025; $973,330 in 2024) | 602,883 | 475,491
Asset-Backed Securities [Member] |  |
Debt Securities, Available-for-Sale [Line Items] |  |
Available-for-Sale, Amortized Cost | 481,614 | 406,597
Available-for-sale, Accumulated Gross Unrealized Gain | 5,212 | 1,408
Available-for-sale, Accumulated Gross Unrealized Loss | (8,897) | (13,668)
Available-for-Sale, Allowance for Credit Loss | 0 | 0
Fixed maturity securities available for sale, at fair value (amortized cost: $1,146,855 in 2025; $973,330 in 2024) | $ 477,929 | $ 394,337

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