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Note 6 - Investments - Unrealized Loss Position (Details) - USD ($) $ in Thousands | Jun. 30, 2023 | Dec. 31, 2022
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US Government Agencies Debt Securities [Member] |  |
Less than 12 months, estimated fair value | $ 4,081 | $ 4,543
Less than 12 Months | 62 | 126
Greater than 12 months, estimated fair value | 10,064 | 10,537
Greater than 12 Months | 573 | 591
Estimated fair value | 14,145 | 15,080
Total, debt securities | 635 | 717
US States and Political Subdivisions Debt Securities [Member] |  |
Less than 12 months, estimated fair value | 838 | 1,040
Less than 12 Months | 19 | 73
Greater than 12 months, estimated fair value | 2,031 | 937
Greater than 12 Months | 136 | 85
Estimated fair value | 2,869 | 1,977
Total, debt securities | 155 | 158
Mortgage-Backed Securities, Issued by US Government Sponsored Enterprises [Member] |  |
Less than 12 months, estimated fair value | 1,328 | 2,248
Less than 12 Months | 24 | 93
Greater than 12 months, estimated fair value | 6,714 | 5,756
Greater than 12 Months | 616 | 554
Estimated fair value | 8,042 | 8,004
Total, debt securities | 640 | 647
Asset-Backed Securities [Member] |  |
Less than 12 months, estimated fair value | 302 | 1,251
Less than 12 Months | 5 | 39
Greater than 12 months, estimated fair value | 1,065 | 299
Greater than 12 Months | 63 | 33
Estimated fair value | 1,367 | 1,550
Total, debt securities | 68 | 72
Corporate Debt Securities [Member] |  |
Less than 12 months, estimated fair value | 1,732 | 3,244
Less than 12 Months | 47 | 155
Greater than 12 months, estimated fair value | 7,604 | 6,760
Greater than 12 Months | 845 | 789
Estimated fair value | 9,336 | 10,004
Total, debt securities | 892 | 944
Fixed Maturities [Member] |  |
Less than 12 months, estimated fair value | 8,281 | 12,326
Less than 12 Months | 157 | 486
Greater than 12 months, estimated fair value | 27,478 | 24,289
Greater than 12 Months | 2,233 | 2,052
Estimated fair value | 35,759 | 36,615
Total, debt securities | $ 2,390 | $ 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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