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Note 8 - Income Taxes (Detail) - Components of Income Tax Benefit (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Income before income tax expense	$ 20,935	$ 9,048
Income tax expense:
Federal income tax expense	4,360	845
State income tax expense	1,933	311
Total income tax expense	$ 6,293	$ 1,156
Effective income tax rate	30.10%	12.80%

- Definition

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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- Definition

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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