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Fair Value Measurements (Details) (USD $)
Jun. 30, 2013
Mar. 31, 2013
Available-for-sale securities, fair value $ 85,265,793 $ 82,751,286
Fair Value, Inputs, Level 1 [Member]
   
Available-for-sale securities, fair value 79,734,874 75,298,160
Fair Value, Inputs, Level 2 [Member]
   
Available-for-sale securities, fair value $ 5,530,919 $ 7,453,126