Marketable Securities (Details 1) (USD $)	Dec. 31, 2013	Dec. 31, 2012
Schedule of Held-to-maturity Securities [Line Items]
Available-for-sale securities, cost	$ 8,069,698	$ 10,524,732
Marketable securities, fair value	8,073,108	10,530,942
Due Within One Year
Schedule of Held-to-maturity Securities [Line Items]
Available-for-sale securities, cost	7,157,746
Marketable securities, fair value	7,161,703
Due After One Year
Schedule of Held-to-maturity Securities [Line Items]
Available-for-sale securities, cost	911,952
Marketable securities, fair value	$ 911,405