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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

X

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Amount, before tax, of unrealized gain in accumulated other comprehensive income (AOCI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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