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Note 6 - Investments - Unrealized Loss Position (Details) - USD ($) $ in Thousands	Sep. 30, 2023	Dec. 31, 2022
US Government Agencies Debt Securities [Member]
Less than 12 months, estimated fair value	$ 3,911	$ 4,543
Less than 12 Months	55	126
Greater than 12 months, estimated fair value	8,993	10,537
Greater than 12 Months	541	591
Estimated fair value	12,904	15,080
Total, debt securities	596	717
US States and Political Subdivisions Debt Securities [Member]
Less than 12 months, estimated fair value	400	1,040
Less than 12 Months	6	73
Greater than 12 months, estimated fair value	2,320	937
Greater than 12 Months	156	85
Estimated fair value	2,720	1,977
Total, debt securities	162	158
Mortgage-Backed Securities, Issued by US Government Sponsored Enterprises [Member]
Less than 12 months, estimated fair value	1,421	2,248
Less than 12 Months	36	93
Greater than 12 months, estimated fair value	7,210	5,756
Greater than 12 Months	696	554
Estimated fair value	8,631	8,004
Total, debt securities	732	647
Asset-Backed Securities [Member]
Less than 12 months, estimated fair value	61	1,251
Less than 12 Months	1	39
Greater than 12 months, estimated fair value	1,192	299
Greater than 12 Months	59	33
Estimated fair value	1,253	1,550
Total, debt securities	60	72
Corporate Debt Securities [Member]
Less than 12 months, estimated fair value	1,205	3,244
Less than 12 Months	25	155
Greater than 12 months, estimated fair value	8,880	6,760
Greater than 12 Months	912	789
Estimated fair value	10,085	10,004
Total, debt securities	937	944
Fixed Maturities [Member]
Less than 12 months, estimated fair value	6,998	12,326
Less than 12 Months	123	486
Greater than 12 months, estimated fair value	28,595	24,289
Greater than 12 Months	2,364	2,052
Estimated fair value	35,593	36,615
Total, debt securities	$ 2,487	$ 2,538

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