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Note 2 - Investments - Summary of Available for Sale Investments (Details) - USD ($) $ in Thousands	Sep. 30, 2023	Dec. 31, 2022
Available-for-Sale, Amortized Cost	$ 647,579	$ 561,580
Available-for-sale, Accumulated Gross Unrealized Gain	491	407
Available-for-sale, Accumulated Gross Unrealized Loss	(55,259)	(46,687)
Available-for-Sale, Allowance for Credit Loss	(904)	(236)
Debt Securities, Available-for-sale	591,907	515,064
US Government Agencies Debt Securities [Member]
Available-for-Sale, Amortized Cost	44,783	50,802
Available-for-sale, Accumulated Gross Unrealized Gain	0	2
Available-for-sale, Accumulated Gross Unrealized Loss	(2,093)	(2,253)
Available-for-Sale, Allowance for Credit Loss	0	0
Debt Securities, Available-for-sale	42,690	48,551
States Territories Possessions Debt Securities [Member]
Available-for-Sale, Amortized Cost	5,842	5,857
Available-for-sale, Accumulated Gross Unrealized Gain	0	49
Available-for-sale, Accumulated Gross Unrealized Loss	(629)	(552)
Available-for-Sale, Allowance for Credit Loss	0	0
Debt Securities, Available-for-sale	5,213	5,354
Political Subdivisions Debt Securities [Member]
Available-for-Sale, Amortized Cost	4,433	4,919
Available-for-sale, Accumulated Gross Unrealized Gain	0	0
Available-for-sale, Accumulated Gross Unrealized Loss	(585)	(621)
Available-for-Sale, Allowance for Credit Loss	0	0
Debt Securities, Available-for-sale	3,848	4,298
Special Revenue Excluding Asset Backed Securities [Member]
Available-for-Sale, Amortized Cost	33,236	37,260
Available-for-sale, Accumulated Gross Unrealized Gain	0	26
Available-for-sale, Accumulated Gross Unrealized Loss	(5,368)	(4,487)
Available-for-Sale, Allowance for Credit Loss	0	0
Debt Securities, Available-for-sale	27,868	32,799
Corporate Debt Securities and Other Debt Obligations [Member]
Available-for-Sale, Amortized Cost	305,998	278,164
Available-for-sale, Accumulated Gross Unrealized Gain	175	79
Available-for-sale, Accumulated Gross Unrealized Loss	(28,336)	(23,912)
Available-for-Sale, Allowance for Credit Loss	(904)	(236)
Debt Securities, Available-for-sale	276,933	254,095
Asset-Backed Securities [Member]
Available-for-Sale, Amortized Cost	253,287	184,578
Available-for-sale, Accumulated Gross Unrealized Gain	316	251
Available-for-sale, Accumulated Gross Unrealized Loss	(18,248)	(14,862)
Available-for-Sale, Allowance for Credit Loss	0	0
Debt Securities, Available-for-sale	$ 235,355	$ 169,967

X

- Definition

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).

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 320
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-Section 50
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