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Stockholders' Equity - Compensation Cost Related to Nonvested Awards (Details) - USD ($)
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]    
Stock Issued During Period, Shares, Restricted Stock Award, Gross 181,908 126,849
Stock Issued During Period, Value, Restricted Stock Award, Gross $ 627,700 $ 698,100
Restricted Stock [Member]    
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]    
weighted average estimated fair value of restricted stock $ 3.45 $ 5.50