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Income Taxes - Components of net deferred tax assets (Details) (USD $) | Mar. 31, 2014 | Mar. 31, 2013
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Deferred tax assets: |  |
Percentage depletion carryforwards | $ 1,463,834 | $ 1,336,630
Deferred stock-based compensation | 29,475 | 24,003
Asset retirement obligation | 298,089 | 252,158
Net operating loss | 298,736 | 503,659
Derivative instruments | 13,944 |
Other | 9,673 | 3,237
Total deferred tax assets | 2,113,751 | 2,119,687
Deferred tax liabilities: |  |
Excess financial accounting bases over tax bases of property and equipment | (2,972,200) | (2,972,886)
Net deferred tax liabilities | $ (858,449) | $ (853,199)

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