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Condensed Consolidated Statements of Comprehensive Income (unaudited) (Parentheticals) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 9 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Sep. 30, 2013
Sep. 30, 2012
Deferred income taxes (in Dollars) $ 1,566 $ 566 $ 2,972 $ 1,638
Changes in Fair Value of Marketable Securities [Member]
       
Deferred income taxes (in Dollars) 195 239 814 524
Realized Gains on Marketable Securities [Member]
       
Deferred income taxes (in Dollars) 0 (314) (2) (579)
Unrealized Losses on Marketable Securities [Member]
       
Deferred income taxes (in Dollars) $ (1) $ 8 $ 11 $ 24