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Note 4. Investments (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 9 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Sep. 30, 2014
Sep. 30, 2013
Dec. 31, 2013
Details          
Available-for-sale Securities, Gross Realized Gains $ 631 $ 56 $ 936 $ 984  
Available-for-sale Securities, Gross Realized Losses 10 78 122 151  
Other than Temporary Impairment, Credit Losses Recognized in Earnings, Credit Losses on Debt Securities Held $ 288   $ 288   $ 288