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Supplemental Disclosure of Cash Flow Information - Schedule of Supplement Cash Flow (Details) - USD ($)
 12 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2015
Supplemental Cash Flow Elements [Abstract]      
Income taxes paid $ 1,495,377 $ 540,000 $ 220,000
Income tax refunds 0 1,556,999 331,733
Non-cash transactions:      
Increase (decrease) in accrued purchases of property and equipment (3,076,245) (2,250,048) 5,422,566
Deferred loan costs charged to oil and gas property costs 0 107,196 0
Oil and natural gas property costs attributable to the recognition of asset retirement obligations 471,864 140,151 576,039
Mengel working interest acquired in Delhi Field litigation settlement 0 596,500 0
Royalty rights acquired through non-monetary exchange of patent and trademark assets 0 108,512 0
Previously acquired Company shares swapped by holders to pay stock option exercise price 77,156 76,500 0
Accrued purchases of treasury stock $ 0 $ (170,283) $ 170,283