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Note 4. Investments (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Dec. 31, 2014
Details      
Proceeds from Sale of Available-for-sale Securities $ 10,041us-gaap_ProceedsFromSaleOfAvailableForSaleSecurities $ 6,768us-gaap_ProceedsFromSaleOfAvailableForSaleSecurities  
Available-for-sale Securities, Gross Realized Gains 157us-gaap_AvailableForSaleSecuritiesGrossRealizedGains 106us-gaap_AvailableForSaleSecuritiesGrossRealizedGains  
Available-for-sale Securities, Gross Realized Losses 34us-gaap_AvailableForSaleSecuritiesGrossRealizedLosses 52us-gaap_AvailableForSaleSecuritiesGrossRealizedLosses  
Other than Temporary Impairment, Credit Losses Recognized in Earnings, Credit Losses on Debt Securities Held $ 288us-gaap_OtherThanTemporaryImpairmentCreditLossesRecognizedInEarningsCreditLossesOnDebtSecuritiesHeld   $ 288us-gaap_OtherThanTemporaryImpairmentCreditLossesRecognizedInEarningsCreditLossesOnDebtSecuritiesHeld