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Marketable Securities (Details) (Common stock [Member], USD $)
Jun. 30, 2013
Dec. 31, 2012
Common stock [Member]
   
Summary of available-for-sale securities    
Investment at cost $ 238,504 $ 238,504
Unrealized gains 115,871 105,842
Unrealized losses      
Estimated fair value $ 354,375 $ 344,346