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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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