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Equity - Options (Details) - USD ($) | 3 Months Ended
--- | ---
Mar. 31, 2018 | Mar. 31, 2017
Stock Based Compensation Plans |  |
Options exercised (in shares) | 5,000 |
Weighted Average Exercise Price (in dollars per share) | $ 24.65 |
Value of options exercised | $ 123,000 |
Market value of options on the date of exercise | $ 205,000 |
Options outstanding at end of the period (in shares) | 20,000 |
Options exercisable at end of the period (in shares) | 20,000 |
2015 Plan |  |
Stock Based Compensation Plans |  |
Total shares reserved for issuance of common stock related to the conversion of preferred stock | 1,400,000 |
Stock options granted (in shares) | 0 | 0
Stock options |  |
Stock Based Compensation Plans |  |
Compensation expense related to share-based award | $ 0 | $ 2,000

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