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Note 6 - Investments - Amortized Cost, Gross Unrealized Gains and Losses, and Estimated Fair Value (Details) - USD ($) $ in Thousands | Sep. 30, 2024 | Dec. 31, 2023
--- | --- | ---
Total | $ 37,635 | $ 38,107
Gross Unrealized Gains | 199 | 53
Gross Unrealized Losses | 978 | 1,687
Fixed maturities, at fair value (amortized cost of $37,635 and $38,107, respectively) | 36,856 | 36,473
US Government Agencies Debt Securities [Member] |  |
Total | 12,872 | 13,384
Gross Unrealized Gains | 77 | 8
Gross Unrealized Losses | 182 | 395
Fixed maturities, at fair value (amortized cost of $37,635 and $38,107, respectively) | 12,767 | 12,997
US States and Political Subdivisions Debt Securities [Member] |  |
Total | 2,843 | 2,885
Gross Unrealized Gains | 9 | 3
Gross Unrealized Losses | 62 | 105
Fixed maturities, at fair value (amortized cost of $37,635 and $38,107, respectively) | 2,790 | 2,783
Mortgage-Backed Security, Issued by US Government-Sponsored Enterprise [Member] |  |
Total | 10,010 | 9,724
Gross Unrealized Gains | 59 | 23
Gross Unrealized Losses | 322 | 494
Fixed maturities, at fair value (amortized cost of $37,635 and $38,107, respectively) | 9,747 | 9,253
Asset-Backed Securities [Member] |  |
Total | 1,328 | 1,254
Gross Unrealized Gains | 8 | 1
Gross Unrealized Losses | 22 | 45
Fixed maturities, at fair value (amortized cost of $37,635 and $38,107, respectively) | 1,314 | 1,210
Corporate Debt Securities [Member] |  |
Total | 10,582 | 10,860
Gross Unrealized Gains | 46 | 18
Gross Unrealized Losses | 390 | 648
Fixed maturities, at fair value (amortized cost of $37,635 and $38,107, respectively) | $ 10,238 | $ 10,230

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