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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, 2024
Mar. 31, 2023
Net realized gains $ 124 $ 210
Fixed Maturities [Member]    
Gross realized gains 0 2
Gross realized losses 0 0
Realized gains (losses) 0 2
Limited Liability Investments [Member]    
Realized gains (losses) 0 98
Limited Liability Investments, Fair Value [Member]    
Realized gains (losses) 115 110
Private Company Investments [Member]    
Realized gains (losses) $ 9 $ 0