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7. Shareholders' Equity (Tables)
 12 Months Ended
Dec. 31, 2018
Equity [Abstract]  
Schedule of stock purchases

The table below describes the purchase of our common stock for the twelve-month periods ended December 31, 2018 and 2017:

 

    Twelve Months Ended  
    December 31, 2018     December 31, 2017  
    Shares     Avg. Price     Shares     Avg. Price  
Open market purchases     1,258,797     $ 3.77       2,693,562     $ 4.48  
Shares redeemed upon net exercise of stock options     33,604       4.37       51,931       4.50  
Other     90,000       4.13       –       –  
Total stock purchases     1,382,401     $ 3.81       2,745,493     $ 4.49  
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,  
    2018     2017     2016  
Expected life (years)     3.99       4.02       4.04  
Risk-free interest rate     2.74 %     1.59 %     1.09 %
Volatility     34 %     36 %     51 %
Expected dividend yield     –       –       –  
Schedule of option activity

Stock option activity for the year ended December 31, 2018 for stock options under the 2006 and 1997 plans is as follows:

 

                Weighted
    Number of     Weighted     Average
    Shares     Average     Remaining
    (in thousands)     Exercise Price     Contractual Term
Options outstanding at the beginning of period     13,135     $ 4.66     N/A
Granted     1,720       3.49     N/A
Exercised     (315 )     1.53     N/A
Forfeited/Expired     (119 )     7.20     N/A
Options outstanding at the end of period     14,421     $ 4.57     3.91 years
                     
Options exercisable at the end of period     8,789     $ 4.76     3.42 years