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Common Stock (Schedule of Non-Vested Restricted Stock) (Details) - 2014 Restricted Stock Plan [Member] - $ / shares
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]    
Shares, Non-vested at January 1, 2016 13,055  
Shares, Vested (3,996)  
Shares, Cancelled   (470)
Shares, Granted 10,440  
Shares, Non-vested at December 31, 2016 19,499 13,055
Weighted-Average Grant Date Fair Value, Non-vested at January 1, 2016 $ 17.66  
Weighted-Average Grant Date Fair Value, Vested 17.38  
Weighted-Average Grant Date Fair Value, Granted 26.65  
Weighted-Average Grant Date Fair Value, Non-vested at December 31, 2016 $ 22.54 $ 17.66