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Note 2 - Investments - Summary of Available for Sale Investments (Details) - USD ($) $ in Thousands | Mar. 31, 2024 | Dec. 31, 2023
--- | --- | ---
Available-for-Sale, Amortized Cost | $ 697,505 | $ 675,130
Available-for-sale, Accumulated Gross Unrealized Gain | 2,997 | 3,876
Available-for-sale, Accumulated Gross Unrealized Loss | (36,606) | (34,303)
Available-for-Sale, Allowance for Credit Loss | (904) | (904)
Fixed maturity securities available for sale, at fair value (amortized cost: $697,505 in 2024; $675,130 in 2023) | 662,992 | 643,799
US Government Agencies Debt Securities [Member] |  |
Available-for-Sale, Amortized Cost | 39,729 | 40,836
Available-for-sale, Accumulated Gross Unrealized Gain | 0 | 0
Available-for-sale, Accumulated Gross Unrealized Loss | (1,387) | (1,416)
Available-for-Sale, Allowance for Credit Loss | 0 | 0
Fixed maturity securities available for sale, at fair value (amortized cost: $697,505 in 2024; $675,130 in 2023) | 38,342 | 39,420
US States and Political Subdivisions Debt Securities [Member] |  |
Available-for-Sale, Amortized Cost | 10,632 | 10,641
Available-for-sale, Accumulated Gross Unrealized Gain | 71 | 100
Available-for-sale, Accumulated Gross Unrealized Loss | (819) | (839)
Available-for-Sale, Allowance for Credit Loss | 0 | 0
Fixed maturity securities available for sale, at fair value (amortized cost: $697,505 in 2024; $675,130 in 2023) | 9,884 | 9,902
Special Revenue Excluding Asset Backed Securities [Member] |  |
Available-for-Sale, Amortized Cost | 32,424 | 32,513
Available-for-sale, Accumulated Gross Unrealized Gain | 96 | 147
Available-for-sale, Accumulated Gross Unrealized Loss | (3,415) | (3,149)
Available-for-Sale, Allowance for Credit Loss | 0 | 0
Fixed maturity securities available for sale, at fair value (amortized cost: $697,505 in 2024; $675,130 in 2023) | 29,105 | 29,511
Corporate Debt Securities and Other Debt Obligations [Member] |  |
Available-for-Sale, Amortized Cost | 337,679 | 316,590
Available-for-sale, Accumulated Gross Unrealized Gain | 1,260 | 1,750
Available-for-sale, Accumulated Gross Unrealized Loss | (18,280) | (17,197)
Available-for-Sale, Allowance for Credit Loss | (904) | (904)
Fixed maturity securities available for sale, at fair value (amortized cost: $697,505 in 2024; $675,130 in 2023) | 319,755 | 300,239
Asset-Backed Securities [Member] |  |
Available-for-Sale, Amortized Cost | 277,041 | 274,550
Available-for-sale, Accumulated Gross Unrealized Gain | 1,570 | 1,879
Available-for-sale, Accumulated Gross Unrealized Loss | (12,705) | (11,702)
Available-for-Sale, Allowance for Credit Loss | 0 | 0
Fixed maturity securities available for sale, at fair value (amortized cost: $697,505 in 2024; $675,130 in 2023) | $ 265,906 | $ 264,727

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