Annual report pursuant to Section 13 and 15(d)

Stock Option and Purchase Plans (Details 1)

v2.4.0.6
Stock Option and Purchase Plans (Details 1)
12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Summary of weighted-average assumptions      
Dividend Yield 0.00% 0.00% 0.00%
Maximum [Member]
     
Summary of weighted-average assumptions      
Risk-free Interest Rate 1.00% 2.82% 3.04%
Volatility Factor 0.64% 0.53% 0.53%
Expected Life in Years 8 years 8 years 8 years
Minimum [Member]
     
Summary of weighted-average assumptions      
Risk-free Interest Rate 0.89% 1.55% 2.33%
Volatility Factor 0.52% 0.52% 0.41%
Expected Life in Years 5 years 7 years 7 years