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Supplemental Disclosure of Cash Flow Information - Schedule of Supplement Cash Flow (Details) - USD ($) | 12 Months Ended
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Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2016
Supplemental Cash Flow Elements [Abstract] |  |  |
Income taxes paid | $ 1,826,754 | $ 1,495,377 | $ 540,000
Income tax refunds | 0 | 0 | 1,556,999
Non-cash transactions: |  |  |
Increase (decrease) in accrued purchases of property and equipment | 1,695,218 | (3,076,245) | (2,250,048)
Deferred loan costs charged to oil and gas property costs | 0 | 0 | 107,196
Oil and natural gas property costs attributable to the recognition of asset retirement obligations | 43,922 | 471,864 | 140,151
Mengel working interest acquired in Delhi Field litigation settlement | 0 | 0 | 596,500
Royalty rights acquired through non-monetary exchange of patent and trademark assets | 0 | 0 | 108,512
Previously acquired Company shares swapped by holders to pay stock option exercise price | 0 | 77,156 | 76,500
Accrued purchases of treasury stock | $ 0 | $ 0 | $ (170,283)

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- Definition Amount of asset retirement obligations incurred during the period, net of certain increases or decreases in the amount of the asset retirement obligation during the current period that may include changes in the amount or timing of the estimated cash flows associated with the settlement of the obligation. + References No definition available. + Details
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- Definition Noncash Gain (Loss) on Litigation Settlement, Fair Value + References No definition available. + Details
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