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Investments in Available-for-Sale Securities (Details Textual) (USD $)
3 Months Ended 9 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Sep. 30, 2013
Sep. 30, 2012
Gain (Loss) on Investments $ 14,511 $ 89 $ 3,419 $ 1,231