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Note 6 - Income Taxes (Details) - Summary of Income Tax Expense at Federal Rate (USD $)
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12 Months Ended | ||
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Dec. 31, 2013
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Dec. 31, 2012
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Dec. 31, 2011
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| Summary of Income Tax Expense at Federal Rate [Abstract] | |||
| Computed tax expense at the statutory rate | $ 14,049,902 | $ 10,263,010 | $ 10,764,571 |
| Reduction in income taxes resulting from: | |||
| Statutory depletion | (1,317,177) | (799,957) | (802,104) |
| State taxes | 312,340 | 227,718 | 238,860 |
| Other, net | (120,995) | (15,703) | (40,178) |
| $ 12,924,070 | $ 9,675,068 | $ 10,161,149 | |
| 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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- Details
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| X | ||||||||||
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- Definition
Amount of current income tax expense (benefit) and deferred income tax expense (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
Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to other adjustments. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to state and local income tax expense (benefit). Reference 1: http://www.xbrl.org/2003/role/presentationRef
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