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Note 6 - Investments - Amortized Cost, Gross Unrealized Gains and Losses, and Estimated Fair Value (Details) - USD ($) $ in Thousands | Mar. 31, 2023 | Dec. 31, 2022
--- | --- | ---
Total | $ 39,267 | $ 40,127
Gross Unrealized Gains | 21 | 2
Gross Unrealized Losses | 2,131 | 2,538
Fixed maturities, at fair value (amortized cost of $39,267 and $40,127, respectively) | 37,157 | 37,591
Total, estimated fair value | 37,157 | 37,591
US Government Agencies Debt Securities [Member] |  |
Total | 15,063 | 15,797
Gross Unrealized Gains | 4 | 0
Gross Unrealized Losses | 551 | 717
Fixed maturities, at fair value (amortized cost of $39,267 and $40,127, respectively) | 14,516 | 15,080
Total, estimated fair value | 14,516 | 15,080
US States and Political Subdivisions Debt Securities [Member] |  |
Total | 3,241 | 2,390
Gross Unrealized Gains | 6 | 0
Gross Unrealized Losses | 127 | 158
Fixed maturities, at fair value (amortized cost of $39,267 and $40,127, respectively) | 3,120 | 2,232
Total, estimated fair value | 3,120 | 2,232
Mortgage-Backed Securities, Issued by US Government Sponsored Enterprises [Member] |  |
Total | 8,550 | 9,058
Gross Unrealized Gains | 3 | 1
Gross Unrealized Losses | 567 | 647
Fixed maturities, at fair value (amortized cost of $39,267 and $40,127, respectively) | 7,986 | 8,412
Total, estimated fair value | 7,986 | 8,412
Asset-Backed Securities [Member] |  |
Total | 1,449 | 1,682
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | 61 | 72
Fixed maturities, at fair value (amortized cost of $39,267 and $40,127, respectively) | 1,388 | 1,610
Total, estimated fair value | 1,388 | 1,610
Corporate Debt Securities [Member] |  |
Total | 10,964 | 11,200
Gross Unrealized Gains | 8 | 1
Gross Unrealized Losses | 825 | 944
Fixed maturities, at fair value (amortized cost of $39,267 and $40,127, respectively) | 10,147 | 10,257
Total, estimated fair value | $ 10,147 | $ 10,257

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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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