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Stock-Based Compensation Plans (Details)	12 Months Ended
Stock-Based Compensation Plans (Details)	Jun. 30, 2012	Jun. 30, 2011
Risk-free interest rates	3.40%	4.10%
Expected option life in years	6 years 6 months	6 years 6 months
Expected stock price volatility	75.44%	77.88%
Expected dividend yield	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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