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Income Taxes - Income Tax Disclosure (Details) (USD $)
 3 Months Ended 6 Months Ended
Jun. 30, 2012
Jun. 30, 2011
Jun. 30, 2012
Jun. 30, 2011
Notes to Financial Statements        
Income tax expense (benefit) $ 113 $ (152) $ 4 $ 93
Deferred tax benefit on unrealized losses on marketable equity securities in other comprehensive income $ 1,011 $ 1,880 $ 1,540 $ 69