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Stock-based Compensation - Summary of the grant-date fair value (USD $)	9 Months Ended
	Dec. 31, 2012	Dec. 31, 2011
Notes To Financial Statements (Details)
Grant-date fair value		$ 5.69
Volatility factor		85.92%
Dividend yield
Risk-free interest rate		1.49%
Expected term (in years)		7 years 99 days

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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