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Note 6 - Investments - Fixed Maturities by Contractual Maturity Periods (Details) - USD ($) $ in Thousands	Mar. 31, 2024	Dec. 31, 2023
Due in one year or less	$ 8,250
Due in one year or less, estimated fair value	8,102
Due after one year through five years	24,004
Due after one year through five years, estimated fair value	22,906
Due after five years through ten years	1,353
Due after five years through ten years, estimated fair value	1,274
Due after ten years	4,688
Due after ten years, estimated fair value	4,303
Total	38,295	$ 38,107
Total, estimated fair value	$ 36,585	$ 36,473

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