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Available-for-Sale-Securities Classification of Available-for-Sale Securities (Details) - USD ($)
Sep. 30, 2017
Dec. 31, 2016
Available-for-sale Securities [Abstract]    
Cash and cash equivalents $ 11,872,900 $ 4,426,800
Marketable securities 44,371,615 0
Total $ 56,244,500 $ 4,426,800