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8. Shareholders' Equity (Tables)
12 Months Ended
Dec. 31, 2014
Shareholders Equity Tables  
Options and Warrants assumptions used

   Year Ended December 31, 
   2014   2013   2012 
Expected life (years)   4.22    5.41    5.63 
Risk-free interest rate   1.43%   0.73%   1.32%
Volatility   55%   80%   79%
Expected dividend yield