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Investment in Available-for-Sale Securities (Details 1) (USD $)
Sep. 30, 2013
Dec. 31, 2012
Due within one year, Cost $ 528,115  
Due after one year through three years, Cost 1,045,080  
Due after three years, Cost 1,015,902  
Available-for-sale Securities, Amortized Cost, Total 2,589,097  
Due within one year, Fair Value 526,184  
Due after one year through three years, Fair Value 1,042,919  
Due after three years, Fair Value 1,012,165  
Available-for-sale Securities, Fair Value, Total $ 2,581,268 $ 2,658,190