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Note 6 - Investments Investment Income (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Net Investment Income [Line Items]      
Gross Investment Income, Operating $ 133,648 $ 120,213 $ 87,011
Investment Income, Investment Expense (6,400) (6,747) (5,474)
Investment Income, Net 127,248 113,466 81,537
Fixed Maturities [Member]      
Net Investment Income [Line Items]      
Gross Investment Income, Operating 122,890 115,880 81,127
Equity securities      
Net Investment Income [Line Items]      
Gross Investment Income, Operating 4,318 86 4,539
Short-term Investments [Member]      
Net Investment Income [Line Items]      
Gross Investment Income, Operating 5,453 3,086 745
Other Security Investments [Member]      
Net Investment Income [Line Items]      
Gross Investment Income, Operating $ 987 $ 1,161 $ 600