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Note 6 - Investments - Unrealized Loss Position (Details) - USD ($) $ in Thousands	Mar. 31, 2023	Dec. 31, 2022
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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