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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)