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7. Shareholders' Equity (Tables)
 12 Months Ended
Dec. 31, 2017
Equity [Abstract]  
Schedule of assumptions for stock options

The dividend yield is estimated to be zero based on our intention not to issue dividends for the foreseeable future.

 

    Year Ended December 31,  
    2017     2016     2015  
Expected life (years)     4.02       4.04       4.21  
Risk-free interest rate     1.59%       1.09%       1.35%  
Volatility     36%       51%       51%  
Expected dividend yield     –       –       –  
Schedule of option activity

Stock option activity for the year ended December 31, 2017 for stock options under the 2006 and 1997 plans is as follows:

 

    Number of Shares
(in thousands)		     Weighted Average Exercise Price     Weighted Average Remaining Contractual Term
Options outstanding at the beginning of period     12,595     $ 4.56      N/A
Granted     1,470       4.35      N/A
Exercised     (647 )     1.68      N/A
Forfeited/Expired     (283 )     5.62      N/A
Options outstanding at the end of period     13,135     $ 4.66     4.45 years
                     
Options exercisable at the end of period     8,789     $ 4.51     4.04 years