Annual report pursuant to section 13 and 15(d)

10. Stock Options Valuation Assumptions (Details)

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10. Stock Options Valuation Assumptions (Details) (Stock Options)
12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Stock Options
   
Risk-free interest rate, Minimum 0.64% 0.85%
Risk-free interest rate, Maximum 0.89% 2.20%
Expected life in years, minimum 5 years 5 years
Expected life in years, maximum   10 years
Dividend yield 0.00% 0.00%
Expected volatility, Minimum 59.15% 59.19%
Expected volatility, Maximum 67.62% 61.68%