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Note 6 - Investments - Unrealized Loss Position (Details) - USD ($) $ in Thousands	Jun. 30, 2023	Dec. 31, 2022
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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