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Note 3 - Fair Value Measurements - Financial Assets and Liabilities Measured at Fair Value on a Recurring Basis (Details) - USD ($) $ in Thousands	Sep. 30, 2023	Dec. 31, 2022
Debt Securities, Available-for-sale	$ 591,907	$ 515,064
Equity securities, at fair value (cost: $43,002 in 2023; $42,352 in 2022)	39,835	38,576
Fair Value, Recurring [Member]
Equity securities, at fair value (cost: $43,002 in 2023; $42,352 in 2022)	39,835	38,576
Cash, cash equivalents, and restricted cash	53,288	68,164
Total assets	685,030	621,804
Fair Value, Inputs, Level 1 [Member] | Fair Value, Recurring [Member]
Equity securities, at fair value (cost: $43,002 in 2023; $42,352 in 2022)	39,835	38,576
Cash, cash equivalents, and restricted cash	53,288	68,164
Total assets	93,123	106,740
Fair Value, Inputs, Level 2 [Member] | Fair Value, Recurring [Member]
Equity securities, at fair value (cost: $43,002 in 2023; $42,352 in 2022)	0	0
Cash, cash equivalents, and restricted cash	0	0
Total assets	591,907	515,064
Fair Value, Inputs, Level 3 [Member] | Fair Value, Recurring [Member]
Equity securities, at fair value (cost: $43,002 in 2023; $42,352 in 2022)	0	0
Cash, cash equivalents, and restricted cash	0	0
Total assets	0	0
US Government Agencies Debt Securities [Member]
Debt Securities, Available-for-sale	42,690	48,551
US Government Agencies Debt Securities [Member] | Fair Value, Recurring [Member]
Debt Securities, Available-for-sale	42,690	48,551
US Government Agencies Debt Securities [Member] | Fair Value, Inputs, Level 1 [Member] | Fair Value, Recurring [Member]
Debt Securities, Available-for-sale	0	0
US Government Agencies Debt Securities [Member] | Fair Value, Inputs, Level 2 [Member] | Fair Value, Recurring [Member]
Debt Securities, Available-for-sale	42,690	48,551
US Government Agencies Debt Securities [Member] | Fair Value, Inputs, Level 3 [Member] | Fair Value, Recurring [Member]
Debt Securities, Available-for-sale	0	0
States Territories Possessions Debt Securities [Member]
Debt Securities, Available-for-sale	5,213	5,354
States Territories Possessions Debt Securities [Member] | Fair Value, Recurring [Member]
Debt Securities, Available-for-sale	5,213	5,354
States Territories Possessions Debt Securities [Member] | Fair Value, Inputs, Level 1 [Member] | Fair Value, Recurring [Member]
Debt Securities, Available-for-sale	0	0
States Territories Possessions Debt Securities [Member] | Fair Value, Inputs, Level 2 [Member] | Fair Value, Recurring [Member]
Debt Securities, Available-for-sale	5,213	5,354
States Territories Possessions Debt Securities [Member] | Fair Value, Inputs, Level 3 [Member] | Fair Value, Recurring [Member]
Debt Securities, Available-for-sale	0	0
Political Subdivisions Debt Securities [Member]
Debt Securities, Available-for-sale	3,848	4,298
Political Subdivisions Debt Securities [Member] | Fair Value, Recurring [Member]
Debt Securities, Available-for-sale	3,848	4,298
Political Subdivisions Debt Securities [Member] | Fair Value, Inputs, Level 1 [Member] | Fair Value, Recurring [Member]
Debt Securities, Available-for-sale	0	0
Political Subdivisions Debt Securities [Member] | Fair Value, Inputs, Level 2 [Member] | Fair Value, Recurring [Member]
Debt Securities, Available-for-sale	3,848	4,298
Political Subdivisions Debt Securities [Member] | Fair Value, Inputs, Level 3 [Member] | Fair Value, Recurring [Member]
Debt Securities, Available-for-sale	0	0
Special Revenue Excluding Asset Backed Securities [Member]
Debt Securities, Available-for-sale	27,868	32,799
Special Revenue Excluding Asset Backed Securities [Member] | Fair Value, Recurring [Member]
Debt Securities, Available-for-sale	27,868	32,799
Special Revenue Excluding Asset Backed Securities [Member] | Fair Value, Inputs, Level 1 [Member] | Fair Value, Recurring [Member]
Debt Securities, Available-for-sale	0	0
Special Revenue Excluding Asset Backed Securities [Member] | Fair Value, Inputs, Level 2 [Member] | Fair Value, Recurring [Member]
Debt Securities, Available-for-sale	27,868	32,799
Special Revenue Excluding Asset Backed Securities [Member] | Fair Value, Inputs, Level 3 [Member] | Fair Value, Recurring [Member]
Debt Securities, Available-for-sale	0	0
Corporate Debt Securities and Other Debt Obligations [Member]
Debt Securities, Available-for-sale	276,933	254,095
Corporate Debt Securities and Other Debt Obligations [Member] | Fair Value, Recurring [Member]
Debt Securities, Available-for-sale	276,933	254,095
Corporate Debt Securities and Other Debt Obligations [Member] | Fair Value, Inputs, Level 1 [Member] | Fair Value, Recurring [Member]
Debt Securities, Available-for-sale	0	0
Corporate Debt Securities and Other Debt Obligations [Member] | Fair Value, Inputs, Level 2 [Member] | Fair Value, Recurring [Member]
Debt Securities, Available-for-sale	276,933	254,095
Corporate Debt Securities and Other Debt Obligations [Member] | Fair Value, Inputs, Level 3 [Member] | Fair Value, Recurring [Member]
Debt Securities, Available-for-sale	0	0
Asset-Backed Securities [Member]
Debt Securities, Available-for-sale	235,355	169,967
Asset-Backed Securities [Member] | Fair Value, Recurring [Member]
Debt Securities, Available-for-sale	235,355	169,967
Asset-Backed Securities [Member] | Fair Value, Inputs, Level 1 [Member] | Fair Value, Recurring [Member]
Debt Securities, Available-for-sale	0	0
Asset-Backed Securities [Member] | Fair Value, Inputs, Level 2 [Member] | Fair Value, Recurring [Member]
Debt Securities, Available-for-sale	235,355	169,967
Asset-Backed Securities [Member] | Fair Value, Inputs, Level 3 [Member] | Fair Value, Recurring [Member]
Debt Securities, Available-for-sale	$ 0	$ 0

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+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 320
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