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Stockholders' Equity (Tables) (Details) - shares
 6 Months Ended
Jun. 30, 2017
Jun. 30, 2018
Dec. 31, 2017
Dec. 31, 2016
Class of Stock [Line Items]        
Preferred Stock, Shares Issued   104,574    
Preferred Stock, Shares Outstanding 104,574 104,574 104,574  
Preferred Series B [Member]        
Class of Stock [Line Items]        
Stock Issued During Period, Shares, New Issues 104,574      
Preferred Stock, Shares Issued   104,574 104,574  
Common Class A [Member]        
Class of Stock [Line Items]        
Common Stock, Shares, Outstanding 7,630,369 7,632,669 7,632,669 7,563,600
Conversion of Stock, Shares Converted 28,018      
Stock Issued During Period, Shares, New Issues 38,751      
Common Stock, Shares, Issued   7,632,669 7,632,669  
Common Class B [Member]        
Class of Stock [Line Items]        
Common Stock, Shares, Outstanding 1,408,382 1,406,082 1,406,082 1,436,400
Conversion of Stock, Shares Converted (28,018)      
Common Stock, Shares, Issued   1,406,082 1,406,082