Fair Value Measurements (Details) (USD $)	Dec. 31, 2013	Mar. 31, 2013
Available-for-sale securities, fair value	$ 90,877,946	$ 82,751,286
Fair Value, Inputs, Level 1 [Member]
Available-for-sale securities, fair value	85,899,526	75,298,160
Fair Value, Inputs, Level 2 [Member]
Available-for-sale securities, fair value	$ 4,978,420	$ 7,453,126