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Note 7 - Investments - Amortized Cost, Gross Unrealized Gains and Losses, and Estimated Fair Value (Details) - USD ($) $ in Thousands | Dec. 31, 2023 | Dec. 31, 2022
--- | --- | ---
Total | $ 38,107 | $ 40,127
Gross Unrealized Gains | 53 | 2
Gross Unrealized Losses | 1,687 | 2,538
Fixed maturities, at fair value (amortized cost of $38,107 and $40,127, respectively) | 36,473 | 37,591
Total, estimated fair value | 36,473 | 37,591
US Government Agencies Debt Securities [Member] |  |
Total | 13,384 | 15,797
Gross Unrealized Gains | 8 | 0
Gross Unrealized Losses | 395 | 717
Fixed maturities, at fair value (amortized cost of $38,107 and $40,127, respectively) | 12,997 | 15,080
Total, estimated fair value | 12,997 | 15,080
US States and Political Subdivisions Debt Securities [Member] |  |
Total | 2,885 | 2,390
Gross Unrealized Gains | 3 | 0
Gross Unrealized Losses | 105 | 158
Fixed maturities, at fair value (amortized cost of $38,107 and $40,127, respectively) | 2,783 | 2,232
Total, estimated fair value | 2,783 | 2,232
Mortgage-Backed Securities, Issued by US Government Sponsored Enterprises [Member] |  |
Total | 9,724 | 9,058
Gross Unrealized Gains | 23 | 1
Gross Unrealized Losses | 494 | 647
Fixed maturities, at fair value (amortized cost of $38,107 and $40,127, respectively) | 9,253 | 8,412
Total, estimated fair value | 9,253 | 8,412
Asset-Backed Securities [Member] |  |
Total | 1,254 | 1,682
Gross Unrealized Gains | 1 | 0
Gross Unrealized Losses | 45 | 72
Fixed maturities, at fair value (amortized cost of $38,107 and $40,127, respectively) | 1,210 | 1,610
Total, estimated fair value | 1,210 | 1,610
Corporate Debt Securities [Member] |  |
Total | 10,860 | 11,200
Gross Unrealized Gains | 18 | 1
Gross Unrealized Losses | 648 | 944
Fixed maturities, at fair value (amortized cost of $38,107 and $40,127, respectively) | 10,230 | 10,257
Total, estimated fair value | $ 10,230 | $ 10,257

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