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Note 6 - Investments - Unrealized Loss Position (Details) - USD ($)
$ in Thousands
Mar. 31, 2024
Dec. 31, 2023
US Government Agencies Debt Securities [Member]    
Less than 12 months, estimated fair value $ 4,960 $ 3,237
Less than 12 Months 70 46
Greater than 12 months, estimated fair value 8,378 7,940
Greater than 12 Months 338 349
Estimated fair value 13,338 11,177
Total, debt securities 408 395
US States and Political Subdivisions Debt Securities [Member]    
Less than 12 months, estimated fair value 434 0
Less than 12 Months 2 0
Greater than 12 months, estimated fair value 2,344 1,705
Greater than 12 Months 107 105
Estimated fair value 2,778 1,705
Total, debt securities 109 105
Mortgage-Backed Security, Issued by US Government-Sponsored Enterprise [Member]    
Less than 12 months, estimated fair value 1,895 737
Less than 12 Months 23 11
Greater than 12 months, estimated fair value 6,655 6,067
Greater than 12 Months 488 483
Estimated fair value 8,550 6,804
Total, debt securities 511 494
Asset-Backed Securities [Member]    
Less than 12 months, estimated fair value 365 0
Less than 12 Months 1 0
Greater than 12 months, estimated fair value 981 1,050
Greater than 12 Months 40 45
Estimated fair value 1,346 1,050
Total, debt securities 41 45
Corporate Debt Securities [Member]    
Less than 12 months, estimated fair value 1,031 937
Less than 12 Months 12 11
Greater than 12 months, estimated fair value 7,790 8,013
Greater than 12 Months 644 637
Estimated fair value 8,821 8,950
Total, debt securities 656 648
Fixed Maturities [Member]    
Less than 12 months, estimated fair value 8,685 4,911
Less than 12 Months 108 68
Greater than 12 months, estimated fair value 26,148 24,775
Greater than 12 Months 1,617 1,619
Estimated fair value 34,833 29,686
Total, debt securities $ 1,725 $ 1,687