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Investment in Available-for-Sale Securities (Details 1) (USD $)
Mar. 31, 2013
Dec. 31, 2012
Due within one year, Cost $ 714,278  
Due after one year through three years, Cost 778,065  
Due after three years, Cost 968,228  
No maturity, Cost 7,905  
Available-for-sale Securities, Amortized Cost, Total 2,468,476  
Due within one year, Fair Value 697,034  
Due after one year through three years, Fair Value 780,271  
Due after three years, Fair Value 978,702  
No maturity, Fair Value 25,546  
Available-for-sale Securities, Fair Value, Total $ 2,481,553 $ 2,658,190