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Note 7 - Investments - Gross Realized Gains and Losses on Available-for-sale Investments, Limited Liability Investment (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Net realized gains $ 761 $ 1,209
Fixed Maturities [Member]    
Gross realized gains 9 2
Gross realized losses (6) (25)
Realized gains (losses) 3 (23)
Limited Liability Investments [Member]    
Realized gains (losses) 238 366
Limited Liability Investments, Fair Value [Member]    
Realized gains (losses) 481 608
Private Company Investments [Member]    
Realized gains (losses) $ 39 $ 258