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Supplemental Disclosure of Cash Flow Information (Tables) | 12 Months Ended
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Jun. 30, 2017
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, 2017, 2016, and 2015 are as follows:
| June 30,
| 2017 |  | 2016 |  | 2015
Income taxes paid | $ | 1,495,377 |  |  | $ | 540,000 |  |  | $ | 220,000 |
Income tax refunds | — |  |  | 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 | — |  |  | 107,196 |  |  | — |
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 | — |  |  | 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 | ) |  | 170,283 |

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