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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

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- 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 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org//1943274/2147481800/320-10-50-2 + Details
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