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Note 2 - Summary of Significant Accounting Policies (Detail) - Assumptions Utilized for Stock Option Grants (USD $)	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Expected life (years)	6 years	6 years
Minimum [Member]
Volatility	45.86%	35.79%	40.08%
Expected life (years)			6 years 6 months
Risk-free interest rate	0.83%	1.21%	1.62%
Dividend yield			0.00%
Fair value (in Dollars per share)	$ 4.23	$ 3.39	$ 0.63
Maximum [Member]
Volatility	48.36%	44.46%	44.31%
Expected life (years)			8 years
Risk-free interest rate	1.15%	2.54%	3.53%
Dividend yield			0.00%
Fair value (in Dollars per share)	$ 6.54	$ 9.28	$ 4.32

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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