Note 3 - Investments (Tables)

12 Months Ended

Dec. 31, 2023

Notes Tables

Schedule of Available-for-Sale Securities Reconciliation [Table Text Block]

December 31, 2023	Amortized Cost or Cost		​Gross Unrealized Gains		​Gross Unrealized Losses			Allowance for Credit Losses			Fair Value
	(in thousands)
Fixed maturities:
U.S. Government	$	40,836	$	—	$	(1,416	)	$	—		$	39,420
U.S. States, Territories, and Political Subdivisions		10,641		100		(839	)		—			9,902
Special revenue excluding mortgage/asset-backed securities		32,513		147		(3,149	)		—			29,511
Corporate and other		316,590		1,750		(17,197	)		(904	)		300,239
Mortgage/asset-backed securities		274,550		1,879		(11,702	)		—			264,727
Total available-for-sale investments	$	675,130	$	3,876	$	(34,303	)	$	(904	)	$	643,799

December 31, 2022	Amortized Cost or Cost		​Gross Unrealized Gains		​Gross Unrealized Losses			Allowance for Credit Losses			Fair Value
	(in thousands)
Fixed maturities:
U.S. Government	$	50,802	$	2	$	(2,253	)	$	—		$	48,551
U.S. States, Territories, and Political Subdivisions		10,776		49		(1,173	)		—			9,652
Special revenue excluding mortgage/asset-backed securities		37,260		26		(4,487	)		—			32,799
Corporate and other		278,164		79		(23,912	)		(236	)		254,095
Mortgage/asset-backed securities		184,578		251		(14,862	)		—			169,967
Total available-for-sale investments	$	561,580	$	407	$	(46,687	)	$	(236	)	$	515,064

Debt Securities, Available-for-Sale, Unrealized Loss Position, Fair Value [Table Text Block]

	Less Than 12 Months					More Than 12 Months					Total
	Fair		Unrealized			Fair		Unrealized			Fair		Unrealized
December 31, 2023	Value		Losses			Value		Losses			Value		Losses
	(in thousands)
Fixed maturity securities:
U.S. Government	$	738	$	(1	)	$	38,063	$	(1,415	)	$	38,801	$	(1,416	)
U.S. States, Territories, and Political Subdivisions		—		—			6,196		(839	)		6,196		(839	)
Special revenue excluding mortgage/asset-backed securities		—		—			26,736		(3,149	)		26,736		(3,149	)
Corporate and other		28,872		(480	)		204,034		(16,717	)		232,906		(17,197	)
Mortgage/asset-backed securities		29,334		(245	)		117,016		(11,457	)		146,350		(11,702	)
Total	$	58,944	$	(726	)	$	392,045	$	(33,577	)	$	450,989	$	(34,303	)

	Less Than 12 Months					More Than 12 Months					Total
	Fair		Unrealized			Fair		Unrealized			Fair		Unrealized
December 31, 2022	Value		Losses			Value		Losses			Value		Losses
	(in thousands)
Fixed maturity securities:
U.S. Government	$	41,077	$	(1,523	)	$	6,853	$	(730	)	$	47,930	$	(2,253	)
U.S. States, Territories, and Political Subdivisions		7,525		(1,173	)		—		—			7,525		(1,173	)
Special revenue excluding mortgage/asset-backed securities		25,091		(3,287	)		5,080		(1,200	)		30,171		(4,487	)
Corporate and other		192,185		(15,667	)		55,605		(8,481	)		247,790		(24,148	)
Mortgage/asset-backed securities		118,815		(9,908	)		32,448		(4,954	)		151,263		(14,862	)
Total	$	384,693	$	(31,558	)	$	99,986	$	(15,365	)	$	484,679	$	(46,923	)

Investments Classified by Contractual Maturity Date [Table Text Block]

	Amortized		Fair
	Cost		Value
	(in thousands)
Due within one year	$	46,366	$	45,221
Due after one year through five years		188,698		180,645
Due after five years through ten years		127,925		118,748
Due after ten years		37,591		34,458
Mortgage and asset-backed securities		274,550		264,727
	$	675,130	$	643,799

Unrealized Gain (Loss) on Investments [Table Text Block]

	Year Ended December 31,
	2023		2022			2021
	(in thousands)
Change in net unrealized gains (losses)
Fixed maturities	$	15,185	$	(53,076	)	$	(10,148	)
Net increase (decrease)	$	15,185	$	(53,076	)	$	(10,148	)

Investment Income [Table Text Block]

	Year Ended December 31,
	2023			2022			2021
	(in thousands)
Interest income	$	23,349		$	13,631		$	9,119
Dividend income		871			739			461
Investment expense		(515	)		(493	)		(500	)
Net investment income	$	23,705		$	13,877		$	9,080

Gain (Loss) on Securities [Table Text Block]

	Year Ended
	December 31,
	2023			2022			2021
	(in thousands)
Realized gains:
Gains on sales of fixed maturity securities	$	89		$	14		$	466
Gains on sales of equity securities		—			—			1,416
Total realized gains		89			14			1,882
Realized losses:
Losses on sales of fixed maturity securities		(32	)		(2,340	)		(1	)
Losses on sales of equity securities		—			—			—
Total realized losses		(32	)		(2,340	)		(1	)
Net realized investment gains (losses)		57			(2,326	)		1,881
Change in allowance for credit losses		(667	)		—			—
Net unrealized gains (losses) on equity securities		3,933			(5,203	)		(604	)
Net unrealized losses on equity method investment		(382	)		—			—
Net realized and unrealized gains (losses) on investments	$	2,941		$	(7,529	)	$	1,277