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Note 6 - Investments Net Investment Income (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Net Investment Income [Line Items]
Gross Investment Income, Operating	$ 159,955	$ 133,648	$ 120,213
Investment Income, Investment Expense	(7,480)	(6,400)	(6,747)
Investment Income, Net	152,475	127,248	113,466
Fixed-maturities available for sale
Net Investment Income [Line Items]
Gross Investment Income, Operating	141,552	122,890	115,880
Equity securities
Net Investment Income [Line Items]
Gross Investment Income, Operating	7,157	4,318	86
Short-term Investments
Net Investment Income [Line Items]
Gross Investment Income, Operating	10,270	5,453	3,086
Other investments
Net Investment Income [Line Items]
Gross Investment Income, Operating	$ 976	$ 987	$ 1,161

X

- Definition

Amount, before investment expense, of income earned from investments in securities and real estate. Includes, but is not limited to, real estate investment, policy loans, dividends, and interest. Excludes realized gain (loss) on investments.

+ References

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-Publisher FASB
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-Topic 944
-SubTopic 220
-Section S99
-Paragraph 1
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