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Note 6. Stock Based Compensation (Detail) - Stock Options, Valuation Assumptions	6 Months Ended	12 Months Ended
	Jun. 30, 2012	Dec. 31, 2011
Expected Term (years)	7 years	7 years
Annual Dividend Rate	0.00%	0.00%
Risk Free Interest Rate	1.58%	1.74%
Volatility	52.92%	50.77%
Expected forfeiture rate	4.00%	4.00%

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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