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Note 2 - Investments - Security Holdings in an Unrealized Loss Position (Details) - USD ($) $ in Thousands	Sep. 30, 2023	Dec. 31, 2022
Less than 12 Months, fair value	$ 162,375	$ 384,693
Less than 12 Months, Accumulated Loss	(5,900)	(31,558)
12 Months or Longer, fair value	387,038	99,986
12 Months or Longer, Accumulated Loss	(49,359)	(15,365)
Fair value	549,413	484,679
Accumulated Loss	(55,259)	(46,923)
US Government Agencies Debt Securities [Member]
Less than 12 Months, fair value	2,338	41,077
Less than 12 Months, Accumulated Loss	(12)	(1,523)
12 Months or Longer, fair value	40,352	6,853
12 Months or Longer, Accumulated Loss	(2,081)	(730)
Fair value	42,690	47,930
Accumulated Loss	(2,093)	(2,253)
States Territories Possessions Debt Securities [Member]
Less than 12 Months, fair value	2,041	3,227
Less than 12 Months, Accumulated Loss	(30)	(552)
12 Months or Longer, fair value	3,172	0
12 Months or Longer, Accumulated Loss	(599)	0
Fair value	5,213	3,227
Accumulated Loss	(629)	(552)
Political Subdivisions Debt Securities [Member]
Less than 12 Months, fair value	0	4,298
Less than 12 Months, Accumulated Loss	0	(621)
12 Months or Longer, fair value	3,848	0
12 Months or Longer, Accumulated Loss	(585)	0
Fair value	3,848	4,298
Accumulated Loss	(585)	(621)
Special Revenue Excluding Asset Backed Securities [Member]
Less than 12 Months, fair value	2,617	25,091
Less than 12 Months, Accumulated Loss	(148)	(3,287)
12 Months or Longer, fair value	25,251	5,080
12 Months or Longer, Accumulated Loss	(5,220)	(1,200)
Fair value	27,868	30,171
Accumulated Loss	(5,368)	(4,487)
Corporate Debt Securities and Other Debt Obligations [Member]
Less than 12 Months, fair value	66,836	192,185
Less than 12 Months, Accumulated Loss	(3,296)	(15,667)
12 Months or Longer, fair value	197,097	55,605
12 Months or Longer, Accumulated Loss	(25,040)	(8,481)
Fair value	263,933	247,790
Accumulated Loss	(28,336)	(24,148)
Asset-Backed Securities [Member]
Less than 12 Months, fair value	88,543	118,815
Less than 12 Months, Accumulated Loss	(2,414)	(9,908)
12 Months or Longer, fair value	117,318	32,448
12 Months or Longer, Accumulated Loss	(15,834)	(4,954)
Fair value	205,861	151,263
Accumulated Loss	$ (18,248)	$ (14,862)

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Amount of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), in continuous unrealized loss position for more than 12 months, without allowance for credit loss. Includes beneficial interest in securitized financial asset.

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