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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, 2023
Dec. 31, 2022
Due within one year, Amortized Cost $ 42,127  
Due within one year, Fair Value 40,783  
Due after one year through five years, Amortized Cost 183,123  
Due after one year through five years, Fair Value 170,789  
Due after five years through ten years, Amortized Cost 131,751  
Due after five years through ten years, Fair Value 114,833  
Due after ten years, Amortized Cost 37,291  
Due after ten years, Fair Value 30,147  
Mortgage and asset-backed securities, Amortized Cost 253,287  
Mortgage and asset-backed securities, Fair Value 235,355  
Amortized Cost 647,579 $ 561,580
Total, Fair Value $ 591,907 $ 515,064