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Investment in Available-for-Sale Securities (Details 1) (USD $)
Dec. 31, 2013
Dec. 31, 2012
Due within one year, Cost $ 805,714  
Due after one year through three years, Cost 852,260  
Due after three years, Cost 882,516  
Available-for-sale Securities, Amortized Cost, Total 2,540,490  
Due within one year, Fair Value 797,042  
Due after one year through three years, Fair Value 859,383  
Due after three years, Fair Value 870,117  
Available-for-sale Securities, Fair Value, Total $ 2,526,542 $ 2,658,190