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Note 7 - Investments - Unrealized Loss Position (Details) - USD ($) $ in Thousands | Dec. 31, 2023 | Dec. 31, 2022
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US Government Agencies Debt Securities [Member] |  |
Less than 12 months, estimated fair value | $ 3,237 | $ 4,543
Less than 12 Months | 46 | 126
Greater than 12 months, estimated fair value | 7,940 | 10,537
Greater than 12 Months | 349 | 591
Estimated fair value | 11,177 | 15,080
Total, debt securities | 395 | 717
US States and Political Subdivisions Debt Securities [Member] |  |
Less than 12 months, estimated fair value | 0 | 1,040
Less than 12 Months | 0 | 73
Greater than 12 months, estimated fair value | 1,705 | 937
Greater than 12 Months | 105 | 85
Estimated fair value | 1,705 | 1,977
Total, debt securities | 105 | 158
Mortgage-Backed Securities, Issued by US Government Sponsored Enterprises [Member] |  |
Less than 12 months, estimated fair value | 737 | 2,248
Less than 12 Months | 11 | 93
Greater than 12 months, estimated fair value | 6,067 | 5,756
Greater than 12 Months | 483 | 554
Estimated fair value | 6,804 | 8,004
Total, debt securities | 494 | 647
Asset-Backed Securities [Member] |  |
Less than 12 months, estimated fair value | 0 | 1,251
Less than 12 Months | 0 | 39
Greater than 12 months, estimated fair value | 1,050 | 299
Greater than 12 Months | 45 | 33
Estimated fair value | 1,050 | 1,550
Total, debt securities | 45 | 72
Corporate Debt Securities [Member] |  |
Less than 12 months, estimated fair value | 937 | 3,244
Less than 12 Months | 11 | 155
Greater than 12 months, estimated fair value | 8,013 | 6,760
Greater than 12 Months | 637 | 789
Estimated fair value | 8,950 | 10,004
Total, debt securities | 648 | 944
Fixed Maturities [Member] |  |
Less than 12 months, estimated fair value | 4,911 | 12,326
Less than 12 Months | 68 | 486
Greater than 12 months, estimated fair value | 24,775 | 24,289
Greater than 12 Months | 1,619 | 2,052
Estimated fair value | 29,686 | 36,615
Total, debt securities | $ 1,687 | $ 2,538

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- Definition Amount of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), in continuous unrealized loss position for more than 12 months, without allowance for credit loss. Includes beneficial interest in securitized financial asset. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Topic 326 -SubTopic 30 -Name Accounting Standards Codification -Section 55 -Paragraph 8 -Publisher FASB -URI https://asc.fasb.org//1943274/2147479081/326-30-55-8 Reference 2: http://fasb.org/us-gaap/role/ref/otherTransitionRef -Topic 320 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 7 -Publisher FASB -URI https://asc.fasb.org//1943274/2147481800/320-10-50-7 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 326 -SubTopic 30 -Name Accounting Standards Codification -Section 50 -Paragraph 5 -Publisher FASB -URI https://asc.fasb.org//1943274/2147479106/326-30-50-5 + Details
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