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Note 7 - Investments - Unrealized Loss Position (Details) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022
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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