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Note 6 - Stock-based Compensation (Detail) - Assumptions on estimation of fair value of stock option granted	9 Months Ended
	Sep. 30, 2012
Expected term (in years)	6 years 109 days
Volatility	104.90%
Risk-free interest rate	1.00%
Dividend yield	0.00%
Expected forfeitures	0.00%

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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