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Property and Equipment - Summary of Property and Equipment (Details) - USD ($)
Jun. 30, 2018
Jun. 30, 2017
Oil and natural gas properties:    
Property costs subject to amortization $ 90,392,918 $ 84,962,933
Less: Accumulated depreciation, depletion, and amortization (29,153,172) (23,172,865)
Unproved properties not subject to amortization 0 0
Oil and natural gas properties, net 61,239,746 61,790,068
Other property and equipment:    
Furniture, fixtures and office equipment, at cost 143,223 135,377
Less: Accumulated depreciation (112,816) (94,688)
Other property and equipment, net $ 30,407 $ 40,689