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Note 6 - Investments - Unrealized Loss Position (Details) - USD ($) $ in Thousands | Mar. 31, 2023 | Dec. 31, 2022
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US Government Agencies Debt Securities [Member] |  |
Less than 12 months, estimated fair value | $ 3,377 | $ 4,543
Less than 12 Months | 53 | 126
Greater than 12 months, estimated fair value | 9,218 | 10,537
Greater than 12 Months | 498 | 591
Estimated fair value | 12,595 | 15,080
Total, debt securities | 551 | 717
US States and Political Subdivisions Debt Securities [Member] |  |
Less than 12 months, estimated fair value | 695 | 1,040
Less than 12 Months | 13 | 73
Greater than 12 months, estimated fair value | 1,345 | 937
Greater than 12 Months | 114 | 85
Estimated fair value | 2,040 | 1,977
Total, debt securities | 127 | 158
Mortgage-Backed Securities, Issued by US Government Sponsored Enterprises [Member] |  |
Less than 12 months, estimated fair value | 1,257 | 2,248
Less than 12 Months | 28 | 93
Greater than 12 months, estimated fair value | 6,038 | 5,756
Greater than 12 Months | 539 | 554
Estimated fair value | 7,295 | 8,004
Total, debt securities | 567 | 647
Asset-Backed Securities [Member] |  |
Less than 12 months, estimated fair value | 646 | 1,251
Less than 12 Months | 17 | 39
Greater than 12 months, estimated fair value | 681 | 299
Greater than 12 Months | 44 | 33
Estimated fair value | 1,327 | 1,550
Total, debt securities | 61 | 72
Corporate Debt Securities [Member] |  |
Less than 12 months, estimated fair value | 1,943 | 3,244
Less than 12 Months | 24 | 155
Greater than 12 months, estimated fair value | 7,822 | 6,760
Greater than 12 Months | 801 | 789
Estimated fair value | 9,765 | 10,004
Total, debt securities | 825 | 944
Fixed Maturities [Member] |  |
Less than 12 months, estimated fair value | 7,918 | 12,326
Less than 12 Months | 135 | 486
Greater than 12 months, estimated fair value | 25,104 | 24,289
Greater than 12 Months | 1,996 | 2,052
Estimated fair value | 33,022 | 36,615
Total, debt securities | $ 2,131 | $ 2,538

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