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Note 6 - Investments - Unrealized Loss Position (Details) - USD ($) $ in Thousands | Sep. 30, 2023 | Dec. 31, 2022
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US Government Agencies Debt Securities [Member] |  |
Less than 12 months, estimated fair value | $ 3,911 | $ 4,543
Less than 12 Months | 55 | 126
Greater than 12 months, estimated fair value | 8,993 | 10,537
Greater than 12 Months | 541 | 591
Estimated fair value | 12,904 | 15,080
Total, debt securities | 596 | 717
US States and Political Subdivisions Debt Securities [Member] |  |
Less than 12 months, estimated fair value | 400 | 1,040
Less than 12 Months | 6 | 73
Greater than 12 months, estimated fair value | 2,320 | 937
Greater than 12 Months | 156 | 85
Estimated fair value | 2,720 | 1,977
Total, debt securities | 162 | 158
Mortgage-Backed Securities, Issued by US Government Sponsored Enterprises [Member] |  |
Less than 12 months, estimated fair value | 1,421 | 2,248
Less than 12 Months | 36 | 93
Greater than 12 months, estimated fair value | 7,210 | 5,756
Greater than 12 Months | 696 | 554
Estimated fair value | 8,631 | 8,004
Total, debt securities | 732 | 647
Asset-Backed Securities [Member] |  |
Less than 12 months, estimated fair value | 61 | 1,251
Less than 12 Months | 1 | 39
Greater than 12 months, estimated fair value | 1,192 | 299
Greater than 12 Months | 59 | 33
Estimated fair value | 1,253 | 1,550
Total, debt securities | 60 | 72
Corporate Debt Securities [Member] |  |
Less than 12 months, estimated fair value | 1,205 | 3,244
Less than 12 Months | 25 | 155
Greater than 12 months, estimated fair value | 8,880 | 6,760
Greater than 12 Months | 912 | 789
Estimated fair value | 10,085 | 10,004
Total, debt securities | 937 | 944
Fixed Maturities [Member] |  |
Less than 12 months, estimated fair value | 6,998 | 12,326
Less than 12 Months | 123 | 486
Greater than 12 months, estimated fair value | 28,595 | 24,289
Greater than 12 Months | 2,364 | 2,052
Estimated fair value | 35,593 | 36,615
Total, debt securities | $ 2,487 | $ 2,538

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