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Stock Options (Details 1)
1 Months Ended
Jun. 30, 2013
Jul. 31, 2012
Jun. 30, 2012
Aug. 31, 2011
Stock Options And Stock-Based Employee Compensation [Line Items]        
Volatility 27.00% 37.00% 37.00% 50.00%
Expected life 1 year 6 months 1 year 6 months 1 year 6 months 1 year 6 months
Expected dividend yield 0.00% 0.00% 0.00% 0.00%
Risk free rate 0.27% 0.30% 0.31% 0.19%