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Income Taxes - Components of net deferred tax assets (Details) (USD $) | Mar. 31, 2013 | Mar. 31, 2012 | Mar. 31, 2011
--- | --- | --- | ---
Deferred tax assets: |  |  |
Percentage depletion carryforwards | $ 1,336,630 | $ 1,336,630 | $ 1,180,896
Deferred stock-based compensation | 24,003 | 13,844 | 2,872
Asset retirement obligation | 252,158 | 205,616 | 179,462
Net operating loss | 503,659 | 171,411 | 125,848
Other | 3,237 | 3,695 | 6,200
Total deferred tax assets | 2,119,687 | 1,731,196 | 1,495,278
Deferred tax liabilities: |  |  |
Excess financial accounting bases over tax bases of property and equipment | (2,972,886) | (2,615,899) | (2,407,941)
Net deferred tax liabilities | $ (853,199) | $ (884,703) | $ (912,663)

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