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Note 6 - Investments - Gross Realized Gains and Losses on Available-for-sale Investments, Limited Liability Investment (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2025
Mar. 31, 2024
Net realized (losses) gains $ (71) $ 124
Fixed Maturities [Member]    
Gross realized gains 0 0
Gross realized losses (72) 0
Realized gains (losses) (72) 0
Limited Liability Investments, Fair Value [Member]    
Realized gains (losses) 0 115
Private Company Investments [Member]    
Realized gains (losses) $ 1 $ 9