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Note 2 - Investments - Summary of Available for Sale Investments (Details) - USD ($) $ in Thousands	Jun. 30, 2025	Dec. 31, 2024
Debt Securities, Available-for-Sale [Line Items]
Available-for-Sale, Amortized Cost	$ 1,130,737	$ 973,330
Available-for-sale, Accumulated Gross Unrealized Gain	9,324	3,217
Available-for-sale, Accumulated Gross Unrealized Loss	(26,695)	(37,257)
Available-for-Sale, Allowance for Credit Loss	0	(244)
Fixed maturity securities available for sale, at fair value (amortized cost: $1,130,737 in 2025; $973,330 in 2024)	1,113,366	939,046
US Government Agencies Debt Securities [Member]
Debt Securities, Available-for-Sale [Line Items]
Available-for-Sale, Amortized Cost	20,635	33,449
Available-for-sale, Accumulated Gross Unrealized Gain	51	6
Available-for-sale, Accumulated Gross Unrealized Loss	(348)	(649)
Available-for-Sale, Allowance for Credit Loss	0	0
Fixed maturity securities available for sale, at fair value (amortized cost: $1,130,737 in 2025; $973,330 in 2024)	20,338	32,806
US States and Political Subdivisions Debt Securities [Member]
Debt Securities, Available-for-Sale [Line Items]
Available-for-Sale, Amortized Cost	19,832	10,606
Available-for-sale, Accumulated Gross Unrealized Gain	58	29
Available-for-sale, Accumulated Gross Unrealized Loss	(1,518)	(857)
Available-for-Sale, Allowance for Credit Loss	0	0
Fixed maturity securities available for sale, at fair value (amortized cost: $1,130,737 in 2025; $973,330 in 2024)	18,372	9,778
Special Revenue Excluding Asset Backed Securities [Member]
Debt Securities, Available-for-Sale [Line Items]
Available-for-Sale, Amortized Cost	19,406	30,283
Available-for-sale, Accumulated Gross Unrealized Gain	13	85
Available-for-sale, Accumulated Gross Unrealized Loss	(2,446)	(3,734)
Available-for-Sale, Allowance for Credit Loss	0	0
Fixed maturity securities available for sale, at fair value (amortized cost: $1,130,737 in 2025; $973,330 in 2024)	16,973	26,634
Corporate Debt Securities and Other Debt Obligations [Member]
Debt Securities, Available-for-Sale [Line Items]
Available-for-Sale, Amortized Cost	588,794	492,395
Available-for-sale, Accumulated Gross Unrealized Gain	5,904	1,689
Available-for-sale, Accumulated Gross Unrealized Loss	(11,863)	(18,349)
Available-for-Sale, Allowance for Credit Loss	0	(244)
Fixed maturity securities available for sale, at fair value (amortized cost: $1,130,737 in 2025; $973,330 in 2024)	582,835	475,491
Asset-Backed Securities [Member]
Debt Securities, Available-for-Sale [Line Items]
Available-for-Sale, Amortized Cost	482,070	406,597
Available-for-sale, Accumulated Gross Unrealized Gain	3,298	1,408
Available-for-sale, Accumulated Gross Unrealized Loss	(10,520)	(13,668)
Available-for-Sale, Allowance for Credit Loss	0	0
Fixed maturity securities available for sale, at fair value (amortized cost: $1,130,737 in 2025; $973,330 in 2024)	$ 474,848	$ 394,337

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