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Fair Value Measurements (Details) (USD $)
Mar. 31, 2015
Mar. 31, 2014
Marketable securities, fair value $ 91,013,095us-gaap_AvailableForSaleSecurities $ 94,382,401us-gaap_AvailableForSaleSecurities
Level 1 [Member]    
Marketable securities, fair value 89,625,984us-gaap_AvailableForSaleSecurities
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel1Member		 89,934,059us-gaap_AvailableForSaleSecurities
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel1Member
Level 2 [Member]    
Marketable securities, fair value $ 1,387,111us-gaap_AvailableForSaleSecurities
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member		 $ 4,448,342us-gaap_AvailableForSaleSecurities
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member