Note 5 - Income Taxes (Detail) - Reconciliation of Statutory Federal Income Tax Rate to Annual Tax Provision (Benefit) (USD $) In Thousands, unless otherwise specified	12 Months Ended
Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Computed “statutory” (benefit) provision (in Dollars)	$ 8,342	$ 81,600	$ (26,092)
Computed “statutory” (benefit) provision	35.00%	35.00%	(35.00%)
Percentage depletion (in Dollars)	(5,575)	(13,751)	(8,858)
Percentage depletion	(24.00%)	(6.00%)	(12.00%)
Net increase (utilization) of U.S. and foreign tax loss carryforwards (in Dollars)	3,837	3,822	2,713
Net increase (utilization) of U.S. and foreign tax loss carryforwards	16.00%	2.00%	3.00%
Change in valuation allowance other than utilization (in Dollars)			(88,069)
Change in valuation allowance other than utilization			(118.00%)
State taxes, net of federal taxes (in Dollars)	1,110	10,890	(4,717)
State taxes, net of federal taxes	5.00%	5.00%	(6.00%)
Effect of U.S. AMT, foreign taxes other (in Dollars)	1,165	(583)	1,491
Effect of U.S. AMT, foreign taxes other	5.00%	(1.00%)	2.00%
(in Dollars)	$ 8,879	$ 81,978	$ (123,532)
	37.00%	35.00%	(13.00%)

A ratio calculated by dividing the reported amount of income tax expense attributable to continuing operations for the period by GAAP-basis pretax income from continuing operations.

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The domestic federal statutory tax rate applicable under enacted tax laws to the Company's pretax income from continuing operations for the period. The "statutory" tax rate is the regular tax rate if there are alternative tax systems.

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The portion of the difference between the effective income tax rate and domestic federal statutory income tax rate attributable to changes in the valuation allowance for deferred tax assets.

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The portion of the difference between the effective income tax rate and domestic federal statutory income tax rate attributable to other deductions received under enacted tax laws not otherwise listed in the existing taxonomy.

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The portion of the difference between the effective income tax rate and domestic federal statutory income tax rate that can be explained by the different methods of depletion allowed under generally accepted accounting principles and enacted tax laws.

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The portion of the difference between the effective income tax rate and domestic federal statutory income tax rate that can be explained by the state and local income tax expense or benefit, net of the federal tax benefit (expense) thereon, recorded during the period.

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The portion of the difference between the effective income tax rate and domestic federal statutory income tax rate that can be explained by tax credits, not otherwise listed in the existing taxonomy, generated or utilized under enacted tax laws during the period.

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The sum of the current income tax expense or benefit and the deferred income tax expense or benefit pertaining to continuing operations.

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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 attributable to other deductions received under enacted tax laws not otherwise listed in the existing taxonomy.

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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.

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