Investment in Available-for-Sale Securities (Details 1) (USD $)	Jun. 30, 2013	Dec. 31, 2012
Due within one year, Cost	$ 798,269
Due after one year through three years, Cost	751,955
Due after three years, Cost	1,074,739
Available-for-sale Securities, Amortized Cost, Total	2,624,963
Due within one year, Fair Value	776,053
Due after one year through three years, Fair Value	752,081
Due after three years, Fair Value	1,067,938
Available-for-sale Securities, Fair Value, Total	$ 2,596,072	$ 2,658,190