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Marketable Securities (Details Textual) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 6 Months Ended
Jun. 30, 2012
Jun. 30, 2011
Jun. 30, 2012
Jun. 30, 2011
Marketable Securities (Textual) [Abstract]        
Gross realized gain from sale of available for sale securities $ 111 $ 16 $ 163 $ 17
Gross realized loss from sale of available for sale securities $ 29 $ 6 $ 36 $ 10