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Supplemental Disclosure of Cash Flow Information (Tables) | 12 Months Ended
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Jun. 30, 2018
Supplemental Cash Flow Elements [Abstract] |
Schedule of supplemental disclosures of cash flow information | Our supplemental disclosures of cash flow information for the years ended June 30, 2018, 2017, and 2016 are as follows:
| June 30,
| 2018 |  | 2017 |  | 2016
Income taxes paid | $ | 1,826,754 |  |  | $ | 1,495,377 |  |  | $ | 540,000 |
Income tax refunds | — |  |  | — |  |  | 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 | — |  |  | — |  |  | 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 | — |  |  | — |  |  | 596,500 |
Royalty rights acquired through non-monetary exchange of patent and trademark assets | — |  |  | — |  |  | 108,512 |
Previously acquired Company shares swapped by holders to pay stock option exercise price | — |  |  | 77,156 |  |  | 76,500 |
Accrued purchases of treasury stock | — |  |  | — |  |  | (170,283 | )

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