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7. Shareholders' Equity (Tables) | 12 Months Ended
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Dec. 31, 2019
Equity [Abstract] |
Schedule of stock purchases | The table below describes the purchase of our common stock for the twelve-month periods ended December 31, 2019 and 2018:
|  | Twelve Months Ended |
|  | December 31, 2019 |  |  | December 31, 2018 |
|  | Shares |  |  | Avg. Price |  |  | Shares |  |  | Avg. Price |
Open market purchases |  |  | 335,546 |  |  | $ | 3.95 |  |  |  | 1,258,797 |  |  | $ | 3.77 |
Shares redeemed upon net exercise of stock options |  |  | 18,424 |  |  |  | 3.76 |  |  |  | 33,604 |  |  |  | 4.37 |
Other |  |  | 24,500 |  |  |  | 4.20 |  |  |  | 90,000 |  |  |  | 4.13 |
Total stock purchases |  |  | 378,470 |  |  | $ | 3.97 |  |  |  | 1,382,401 |  |  | $ | 3.81 |
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, |
|  | 2019 |  |  | 2018 |  |  | 2017 |
Expected life (years) |  |  | 4.02 |  |  |  | 3.99 |  |  |  | 4.02 |
Risk-free interest rate |  |  | 1.53% |  |  |  | 2.74% |  |  |  | 1.59% |
Volatility |  |  | 37% |  |  |  | 34% |  |  |  | 36% |
Expected dividend yield |  |  | – |  |  |  | – |  |  |  | – |
Schedule of option activity |
|  | Number of Shares (in thousands) |  |  | Weighted Average Exercise Price |  |  | Weighted Average Remaining Contractual Term
Options outstanding at the beginning of period |  |  | 14,421 |  |  | $ | 4.57 |  |  | N/A
Granted |  |  | 1,490 |  |  |  | 3.53 |  |  | N/A
Exercised |  |  | (488 | ) |  |  | 0.86 |  |  | N/A
Forfeited/Expired |  |  | (75 | ) |  |  | 4.00 |  |  | N/A
Options outstanding at the end of period |  |  | 15,348 |  |  | $ | 4.59 |  |  | 3.34 years
Options exercisable at the end of period |  |  | 11,717 |  |  | $ | 4.87 |  |  | 2.69 years

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- Definition Tabular disclosure for stock option plans. Includes, but is not limited to, outstanding awards at beginning and end of year, grants, exercises, forfeitures, and weighted-average grant date fair value. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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- Definition Tabular disclosure of the significant assumptions used during the year to estimate the fair value of stock options, including, but not limited to: (a) expected term of share options and similar instruments, (b) expected volatility of the entity's shares, (c) expected dividends, (d) risk-free rate(s), and (e) discount for post-vesting restrictions. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (f)(2) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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