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Income Taxes (Tables) | 12 Months Ended
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Mar. 31, 2013
Income Tax Disclosure [Abstract] |
Components of net deferred tax assets (liabilities) |
|  | 2013 |  | 2012 |  | 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
| 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)
Reconciliation of the provision for income taxes to income taxes computed |
|  | 2013 |  | 2012 |  | 2011
Tax expense at federal statutory rate (1) | $ (70,678) |  | $ 102,691 |  | $ 47,634
Statutory depletion carryforward | -- |  | (155,734) |  | (86,221)
Effect of graduated rates | 3,391 |  | (16,940) |  | (3,074)
Revision of prior year estimates | -- |  | 4,314 |  | 44,503
Permanent differences | 35,783 |  | 30,210 |  | (17,309)
Other | -- |  | 7,499 |  | (1,129)
| Total income tax benefit | $ (31,504) |  | $ (27,960) |  | $ (15,596)
| Effective income tax rate | (15%) |  | (9%) |  | (11%)
Reconciliation of the beginning and ending balances of unrecognized tax benefits |
| 2013 |  | 2012 |  | 2011
Unrecognized tax benefits at beginning of period | $ 677,000 |  | $ 670,000 |  | $ 524,000
Additions based on tax positions related to the current year | - |  | - |  | 146,000
Changes to tax positions of prior years | - |  | 7,000 |  | -
Settlements | - |  | - |  | -
Expirations | - |  | - |  | -
Unrecognized tax benefits at end of period | $ 677,000 |  | $ 677,000 |  | $ 670,000

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- Definition Tabular disclosure of the components of net deferred tax asset or liability recognized in an entity's statement of financial position, including the following: the total of all deferred tax liabilities, the total of all deferred tax assets, the total valuation allowance recognized for deferred tax assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32537-109319 + Details
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- Definition Tabular disclosure of the reconciliation using percentage or dollar amounts of the reported amount of income tax expense attributable to continuing operations for the year to the amount of income tax expense that would result from applying domestic federal statutory tax rates to pretax income from continuing operations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32687-109319 + Details
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- Definition Tabular disclosure of the change in unrecognized tax benefits. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 55 -Paragraph 217 -URI http://asc.fasb.org/extlink&oid=21917533&loc=d3e36027-109320 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 15A -URI http://asc.fasb.org/extlink&oid=6907707&loc=SL6600010-109319 + Details
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