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Investments in Available-for-Sale Securities (Details Textual) (USD $)
3 Months Ended 6 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Jun. 30, 2013
Jun. 30, 2012
Gain (Loss) on Investments $ 25,104 $ 660 $ 14,118 $ 1,141