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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 6 Months Ended
Jun. 30, 2025
Jun. 30, 2024
Jun. 30, 2025
Jun. 30, 2024
Net realized gains $ 128 $ 277 $ 57 $ 401
Fixed Maturities [Member]        
Gross realized gains 0 0 0 0
Gross realized losses (4) 0 (76) 0
Realized gains (losses) (4) 0 (76) 0
Limited Liability Investments, Fair Value [Member]        
Realized gains (losses) 95 271 95 386
Private Company Investments [Member]        
Realized gains (losses) $ 37 $ 6 $ 38 $ 15