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CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($)
 3 Months Ended 12 Months Ended
Mar. 31, 2018
Dec. 31, 2017
Preferred Stock, Par Value Per Share $ 1.00 $ 1.00
Preferred Stock, Shares Authorized 20,000,000 20,000,000
Preferred Stock, Shares Issued 104,574  
Accumulated Depreciation, Property, Plant, and Equipment $ 2,300,000 $ 1,900,000
Preferred Series B [Member]    
Preferred Stock, Par Value Per Share $ 1.00  
Preferred Stock, Dividend Rate, Percentage 7.50% 7.50%
Preferred Stock, Shares Issued 104,574 104,574
Preferred Stock, Liquidation Preference, Value $ 113,500,000 $ 111,500,000
Common Class A [Member]    
Common Stock, Par or Stated Value Per Share $ 0.10 $ 0.10
Common Stock, Shares Authorized 70,000,000 70,000,000
Common Stock, Shares, Issued 7,632,669 7,632,669
Common Class B [Member]    
Common Stock, Par or Stated Value Per Share $ 0.10 $ 0.10
Common Stock, Shares Authorized 30,000,000 30,000,000
Common Stock, Shares, Issued 1,406,082 1,406,082