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Stock-based Compensation - Summary of the grant-date fair value (Details) (USD $)
6 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Notes to Financial Statements    
Grant-date fair value $ 4.75   
Volatility factor 77.01%   
Dividend yield      
Risk-free interest rate 1.74%   
Expected term (in years) 7 years 0 days