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Note 14 - Stock-based Compensation (Detail) - Fair Value Of Each Option Grant Assumptions Used (USD $)	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Risk free rate	0.40%	1.00%	1.40%
Expected life in years	4 years 9 months	4 years 9 months	4 years 9 months
Expected volatility	40.30%	39.40%	39.80%
Dividend yield	0.00%	0.00%	0.00%
Weighted average fair value per option granted (in Dollars per share)	$ 10.87	$ 10.73	$ 6.85

The estimated measure of the percentage by which a share price is expected to fluctuate during a period. Volatility also may be defined as a probability-weighted measure of the dispersion of returns about the mean. The volatility of a share price is the standard deviation of the continuously compounded rates of return on the share over a specified period. That is the same as the standard deviation of the differences in the natural logarithms of the stock prices plus dividends, if any, over the period.

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