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Income Taxes - Balance Sheet Items (Details) - USD ($)
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2016
Income Tax Disclosure [Abstract]      
Current deferred tax asset $ 0 $ 0 $ 105,321
Non-current deferred tax liability 10,555,435 15,826,291 11,840,693
Net liability $ 10,555,435 $ 15,826,291 $ 11,735,372