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Note 8 - Income Taxes | 9 Months Ended
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Sep. 30, 2013
Income Tax Disclosure [Abstract] |
Income Tax Disclosure [Text Block] | 8. Income Taxes For the three-month and nine-month periods ended September 30, 2013 and 2012, our income tax expense and effective income tax rates were as follows (dollars in thousands):
|  | Three Months Ended September 30, |  |  | Nine Months Ended September 30, |
|  | 2013 |  |  | 2012 |  |  | 2013 |  |  | 2012 |
Income tax expense |  | $ | 4,491 |  |  | $ | 10,035 |  |  | $ | 9,715 |  |  | $ | 19,250 |
Effective income tax rate |  |  | 38.8 | % |  |  | 38.7 | % |  |  | 42.6 | % |  |  | 38.9 | %
We estimate our differences between taxable income and recorded income on an annual basis. Our tax provision for each interim reporting period is based upon these full year projections which are revised each interim reporting period. These projections incorporate estimates of permanent differences between U.S. GAAP income and taxable income, state income taxes, adjustments to our liability for unrecognized tax benefits and other items as necessary to adjust our statutory Federal income tax rate to our effective income tax rate. For the nine-month period ended September 30, 2013, these estimates increased or decreased our statutory Federal income tax rate of 35.0% to our effective income tax rate of 42.6% as follows: an adjustment resulting from the expiration of certain unexercised stock options added 2.7%, state income taxes added 2.9%, permanent differences between our U.S. GAAP income and taxable income added 1.8%, and an adjustment for the write off of stock options deferred under Section 162(m) of the internal revenue code added 0.6%, while adjustments to our reserve for uncertain tax positions resulted in a reduction of 0.4%. For the nine-month period ended September 30, 2012, these estimates increased or decreased our statutory Federal income tax rate of 35.0% to our effective income tax rate of 38.9% as follows: state income taxes added 4.6% and permanent differences between our U.S. GAAP income and taxable income added 0.5%, while adjustments to our reserve for uncertain tax positions resulted in a reduction of 1.2%.

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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 Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 15 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32718-109319 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=26873400&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 9 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32639-109319 Reference 5: 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 6: 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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