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Derivatives (Details) - USD ($)
6 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Jun. 30, 2017
Derivative Instruments and Hedging Activities Disclosure [Abstract]      
Derivatives held $ 0   $ 0
Gain (losses) on derivatives $ 0 $ (14,042)  
Gain on settled derivatives   90  
Unrealized loss on open positions   $ 14,132