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Note 6 - Income Taxes (Detail) - Summary of income tax expense at Federal rate: (USD $)
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12 Months Ended | ||
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Dec. 31, 2012
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Dec. 31, 2011
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Dec. 31, 2010
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| Computed tax expense at the statutory rate | $ 10,263,010 | $ 10,764,571 | $ 5,584,222 |
| Reduction in income taxes resulting from: | |||
| Statutory depletion | (799,957) | (802,104) | (614,358) |
| State taxes | 227,718 | 238,860 | 140,559 |
| Other, net | (15,703) | (40,178) | 5,047 |
| $ 9,675,068 | $ 10,161,149 | $ 5,115,470 | |
| X | ||||||||||
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- Definition
Income Tax Reconciliation Statutory Deductions No definition available.
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| X | ||||||||||
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- Details
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| X | ||||||||||
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- Definition
The sum of the current income tax expense or benefit and the deferred income tax expense or benefit pertaining to continuing operations. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
The amount of income tax expense or benefit for the period computed by applying the domestic federal statutory tax rates to pretax income from continuing operations. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
The portion of the difference, between total income tax expense or benefit as reported in the Income Statement for the year/accounting period and the expected income tax expense or benefit computed by applying the domestic federal statutory income tax rates to pretax income from continuing operations, that is attributable to all other items not otherwise listed in the existing taxonomy. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
The portion of the difference, between total income tax expense or benefit as reported in the Income Statement for the period and the expected income tax expense or benefit computed by applying the domestic federal statutory income tax rates to pretax income from continuing operations, that is attributable to state and local income tax expense or benefit. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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