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Note 3 - Income Taxes | 3 Months Ended
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Mar. 31, 2013
Income Tax Disclosure [Text Block] | Note 3. Income Taxes Major components of our income tax provision for the three months ended March 31, 2013 and 2012 are as follows (in thousands):
|  | Three Months Ended March 31, |
|  | 2013 |  |  | 2012 |
Current: |  |  |  |  |  |  |  |
Federal |  | $ | 2,231 |  |  | $ | 3,672 |
State |  |  | 906 |  |  |  | 551 |
Foreign |  |  | 115 |  |  |  | 115 |
Total current income tax provision |  |  | 3,252 |  |  |  | 4,338 |
Deferred: |  |  |  |  |  |  |  |
Federal and state deferred income tax provision |  |  | 4,163 |  |  |  | 2,977 |
Total income tax provision |  | $ | 7,415 |  |  | $ | 7,315 |
Our ability to utilize our deferred tax assets depends on future taxable income generated from operations. For the three months ended March 31, 2013, there were no circumstances that caused us to change our assessment of the ability to generate sufficient future taxable income to realize the currently recognized U.S. deferred tax assets. After utilization of $4.0 million during the first three months of 2013, the net deferred tax asset at March 31, 2013 was $111.8 million. It is possible that the valuation allowance on our deferred tax asset will change in the future as a result of the analysis of our long-range forecasts, with a resulting tax provision or benefit. The current income tax provisions for the three months ended March 31, 2013 and 2012 vary from the amounts that would have resulted from applying the statutory income tax rate to pre-tax income primarily due to the effects of percentage depletion for all periods presented and the change in valuation allowance related to foreign operations.

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- Definition The entire disclosure for income taxes. Disclosures may include net deferred tax liability or asset recognized in an enterprise's statement of financial position, net change during the year in the total valuation allowance, approximate tax effect of each type of temporary difference and carryforward that gives rise to a significant portion of deferred tax liabilities and deferred tax assets, utilization of a tax carryback, and tax uncertainties information. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 109 -Paragraph 136, 172 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(h)) -URI http://asc.fasb.org/extlink&oid=6881521&loc=d3e23780-122690 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 08 -Paragraph h -Article 4 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 15 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32718-109319 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 109 -Paragraph 43, 44, 45, 46, 47, 48, 49 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 6: 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 Reference 7: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 9 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32639-109319 Reference 8: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32559-109319 + Details
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