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Asset Retirement Obligations (Tables) | 6 Months Ended
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Dec. 31, 2018
Asset Retirement Obligation Disclosure [Abstract] |
Schedule of reconciliations of the beginning and ending asset retirement obligation balances | The following is a reconciliation of the beginning and ending asset retirement obligations for the six months ended December 31, 2018 and for the year ended June 30, 2018:
| December 31, 2018 |  | June 30, 2018
Asset retirement obligations — beginning of period | $ | 1,422,955 |  |  | $ | 1,288,743 |
Liabilities incurred | 31,268 |  |  | 44,700 |
Accretion of discount | 48,962 |  |  | 90,290 |
Revision of previous estimates | — |  |  | (778 | )
Asset retirement obligations — end of period | $ | 1,503,185 |  |  | $ | 1,422,955 |
Less current portion in accrued liabilities | (35,539 | ) |  | (35,539 | )
Long-term portion of asset retirement obligations | $ | 1,467,646 |  |  | $ | 1,387,416 |

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- Definition Tabular disclosure of the changes in carrying amount of a liability for asset retirement obligations, for changes such as new obligations, changes in estimates of existing obligations, spending on existing obligations, property dispositions, and foreign currency translation. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 410 -SubTopic 30 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=6393242&loc=d3e13201-110859 + Details
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