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Stockholders' Equity (Tables) (Details) - shares
Mar. 31, 2018
Dec. 31, 2017
Mar. 31, 2017
Dec. 31, 2016
Class of Stock [Line Items]        
Preferred Stock, Shares Issued 104,574   104,574  
Preferred Stock, Shares Outstanding 104,574 104,574 104,574  
Common Class A [Member]        
Class of Stock [Line Items]        
Common Stock, Shares, Outstanding 7,632,669 7,632,669 7,563,600 7,563,600
Common Stock, Shares, Issued 7,632,669 7,632,669    
Common Class B [Member]        
Class of Stock [Line Items]        
Common Stock, Shares, Outstanding 1,406,082 1,406,082 1,436,400 1,436,400
Common Stock, Shares, Issued 1,406,082 1,406,082