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Financial Condition (Details Textual) - USD ($)
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2014
Financial Condition [Line Items]        
Cash and cash equivalents $ 15,099,461 $ 24,162,185 $ 31,467,748 $ 36,696,892
Retained Earnings (Accumulated Deficit) (75,128,691) (64,824,201)    
Liabilities, Current, Total $ 4,665,518 $ 6,744,014    
Series C Convertible Debentures [Member]        
Financial Condition [Line Items]        
Debt Instrument, Convertible, Conversion Price $ 5.25      
Liabilities, Current, Total $ 4,700,000