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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)