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7. Income Taxes - Components of net deferred tax assets (Details) - USD ($) | Mar. 31, 2015 | Mar. 31, 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
Total deferred tax assets | 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)

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