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Note 15 - Stock-Based Compensation (Detail) - Weighted Average Assumptions	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
Expected volatility	69.90%	59.50%	68.10%	59.60%
Expected term (in years)	7 years	6 years	7 years	6 years
Risk-free rate	1.00%	1.10%	1.10%	1.80%
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.

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