XML 15 R55.htm IDEA: XBRL DOCUMENT

Note 15 - Stock-Based Compensation (Detail) - Weighted Average Assumptions	3 Months Ended		6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011
Expected volatility	63.80%	60.60%	62.00%	59.60%
Expected term (in years)	5 years 328 days	6 years	6 years 292 days	6 years
Risk-free rate	1.10%	1.80%	1.40%	1.90%
Employees [Member]
Forfeiture rate	25.00%	20.00%	25.00%	20.00%
Officers and Directors [Member]
Forfeiture rate	0.00%	0.00%	0.00%	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.

+ References+ Details