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Equity - Options (Details) - USD ($) | 9 Months Ended
--- | ---
Sep. 30, 2019 | Sep. 30, 2018
Stock Based Compensation Plans |  |
Stock options granted (in shares) | 0 | 0
Options exercised (in shares) | 5,000 | 5,000
Weighted Average Exercise Price (in dollars per share) | $ 24.65 | $ 24.65
Value of options exercised | $ 123,000 | $ 123,000
Market value of options on the date of exercise | $ 233,000 | $ 205,000
Options outstanding at end of the period (in shares) | 15,000 |
Options exercisable at end of the period (in shares) | 15,000 |
2015 Plan |  |
Stock Based Compensation Plans |  |
Total shares reserved for issuance of common stock related to the conversion of preferred stock | 1,400,000 |

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