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Shareholders' Equity - Restricted Stock (Details) - USD ($) | 6 Months Ended
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Jun. 30, 2017 | Jun. 30, 2016
Equity [Abstract] |  |
Stock Issued During Period, Shares, Restricted Stock Award, Gross | 132,726 | 107,719
Stock Issued During Period, Value, Restricted Stock Award, Gross | $ 469,900 | $ 651,700

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