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Note 3 - Investments - Summary of Available for Sale Investments (Details) - USD ($)	Dec. 31, 2025	Dec. 31, 2024
Debt Securities, Available-for-Sale [Line Items]
Available-for-Sale, Amortized Cost	$ 1,227,605,000	$ 973,330,000
Available-for-sale, Accumulated Gross Unrealized Gain	16,093,000	3,217,000
Available-for-sale, Accumulated Gross Unrealized Loss	(19,511,000)	(37,257,000)
Available-for-Sale, Allowance for Credit Loss	0	(244,000)
Fixed maturity securities available for sale, at fair value (amortized cost: $1,227,605 in 2025; $973,330 in 2024)	1,224,187,000	939,046,000
US Government Agencies Debt Securities [Member]
Debt Securities, Available-for-Sale [Line Items]
Available-for-Sale, Amortized Cost	23,716,000	33,449,000
Available-for-sale, Accumulated Gross Unrealized Gain	97,000	6,000
Available-for-sale, Accumulated Gross Unrealized Loss	(226,000)	(649,000)
Available-for-Sale, Allowance for Credit Loss	0	0
Fixed maturity securities available for sale, at fair value (amortized cost: $1,227,605 in 2025; $973,330 in 2024)	23,587,000	32,806,000
US States and Political Subdivisions Debt Securities [Member]
Debt Securities, Available-for-Sale [Line Items]
Available-for-Sale, Amortized Cost	19,745,000	10,606,000
Available-for-sale, Accumulated Gross Unrealized Gain	111,000	29,000
Available-for-sale, Accumulated Gross Unrealized Loss	(994,000)	(857,000)
Available-for-Sale, Allowance for Credit Loss	0	0
Fixed maturity securities available for sale, at fair value (amortized cost: $1,227,605 in 2025; $973,330 in 2024)	18,862,000	9,778,000
Special Revenue Excluding Asset Backed Securities [Member]
Debt Securities, Available-for-Sale [Line Items]
Available-for-Sale, Amortized Cost	19,280,000	30,283,000
Available-for-sale, Accumulated Gross Unrealized Gain	72,000	85,000
Available-for-sale, Accumulated Gross Unrealized Loss	(1,887,000)	(3,734,000)
Available-for-Sale, Allowance for Credit Loss	0	0
Fixed maturity securities available for sale, at fair value (amortized cost: $1,227,605 in 2025; $973,330 in 2024)	17,465,000	26,634,000
Corporate Debt Securities and Other Debt Obligations [Member]
Debt Securities, Available-for-Sale [Line Items]
Available-for-Sale, Amortized Cost	606,748,000	492,395,000
Available-for-sale, Accumulated Gross Unrealized Gain	9,891,000	1,689,000
Available-for-sale, Accumulated Gross Unrealized Loss	(8,404,000)	(18,349,000)
Available-for-Sale, Allowance for Credit Loss	0	(244,000)
Fixed maturity securities available for sale, at fair value (amortized cost: $1,227,605 in 2025; $973,330 in 2024)	608,235,000	475,491,000
Asset-Backed Securities [Member]
Debt Securities, Available-for-Sale [Line Items]
Available-for-Sale, Amortized Cost	558,116,000	406,597,000
Available-for-sale, Accumulated Gross Unrealized Gain	5,922,000	1,408,000
Available-for-sale, Accumulated Gross Unrealized Loss	(8,000,000)	(13,668,000)
Available-for-Sale, Allowance for Credit Loss	0	0
Fixed maturity securities available for sale, at fair value (amortized cost: $1,227,605 in 2025; $973,330 in 2024)	$ 556,038,000	$ 394,337,000

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