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Note 2 - Investments - The Amortized Cost and Fair Value of Fixed Maturity Securities by Contractual Maturity (Details) - USD ($) $ in Thousands	Sep. 30, 2025	Dec. 31, 2024
Investments, Debt and Equity Securities [Abstract]
Due within one year, Amortized Cost	$ 71,849
Due within one year, Fair Value	71,977
Due after one year through five years, Amortized Cost	260,401
Due after one year through five years, Fair Value	260,035
Due after five years through ten years, Amortized Cost	226,631
Due after five years through ten years, Fair Value	228,747
Due after ten years, Amortized Cost	106,360
Due after ten years, Fair Value	102,679
Mortgage and asset-backed securities, Amortized Cost	481,614
Mortgage and asset-backed securities, Fair Value	477,929
Amortized Cost	1,146,855	$ 973,330
Total, Fair Value	$ 1,141,367	$ 939,046

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