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7. Income Taxes (Tables) | 12 Months Ended
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Mar. 31, 2015
Income Tax Disclosure [Abstract] |
Components of net deferred tax assets (liabilities) |
|  | 2015 |  | 2014
Deferred tax assets: |  |  |  |  |  |  |  |
Percentage depletion carryforwards |  | $ | 1,535,126 |  |  | $ | 1,463,834 |
Deferred stock-based compensation |  |  | 36,958 |  |  |  | 29,475 |
Asset retirement obligation |  |  | 384,467 |  |  |  | 298,089 |
Net operating loss |  |  | 720,308 |  |  |  | 298,736 |
Derivative instruments |  |  | — |  |  |  | 13,944 |
Other |  |  | 11,111 |  |  |  | 9,673 |
|  |  | 2,687,970 |  |  |  | 2,113,751 |
Deferred tax liabilities: |  |  |  |  |  |  |  |
Excess financial accounting bases over tax bases of property and equipment |  |  | (3,348,840 | ) |  |  | (2,972,200 | )
Net deferred tax liabilities |  | $ | (660,870 | ) |  | $ | (858,449 | )
Income tax provision constituents |
|  | 2015 |  | 2014 |  | 2013
Current income tax expense |  | $ | — |  |  | $ | 6,500 |  |  | $ | — |
Deferred income tax (benefit) expense |  |  | (197,499 | ) |  |  | 5,250 |  |  |  | (31,504 | )
Total income tax provision: |  | $ | (197,499 | ) |  | $ | 11,750 |  |  | $ | (31,504 | )
Effective tax rate |  |  | (37 | %) |  |  | 4 | % |  |  | (15 | %)
Reconciliation of the provision for income taxes to income taxes computed |
|  | 2015 |  | 2014 |  | 2013
Tax expense at federal statutory rate (1) |  | $ | (183,085 | ) |  | $ | 106,374 |  |  | $ | (70,678 | )
Statutory depletion carryforward |  |  | (71,292 | ) |  |  | (127,204 | ) |  |  | — |
Effect of graduated rates |  |  | 12,221 |  |  |  | (13,841 | ) |  |  | 3,391 |
Permanent differences |  |  | 44,576 |  |  |  | 46,421 |  |  |  | 35,783 |
Total income tax (benefit) expense |  | $ | (197,499 | ) |  | $ | 11,750 |  |  | $ | (31,504 | )
Effective income tax rate |  |  | (37 | %) |  |  | 4 | % |  |  | (15 | %)
(1) The federal statutory rate was 34% for fiscal years ending March 31, 2015, 2014 and 2013.
Reconciliation of the beginning and ending balances of unrecognized tax benefits |
|  | 2015 |  | 2014 |  | 2013
Unrecognized tax benefits at beginning of period |  | $ | 679,000 |  |  | $ | 677,000 |  |  | $ | 677,000 |
Additions based on tax positions related to the current year |  |  | — |  |  |  | 2,000 |  |  |  | — |
Changes to tax positions of prior years |  |  | — |  |  |  | — |  |  |  | — |
Settlements |  |  | — |  |  |  | — |  |  |  | — |
Expirations |  |  | — |  |  |  | — |  |  |  | — |
Unrecognized tax benefits at end of period |  | $ | 679,000 |  |  | $ | 679,000 |  |  | $ | 677,000 |

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