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Fair Value Measurements (Details) (USD $)
Sep. 30, 2013
Mar. 31, 2013
Available-for-sale securities, fair value $ 87,470,945 $ 82,751,286
Fair Value, Inputs, Level 1 [Member]
   
Available-for-sale securities, fair value 82,466,602 75,298,160
Fair Value, Inputs, Level 2 [Member]
   
Available-for-sale securities, fair value $ 5,004,343 $ 7,453,126