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Stockholders' Equity (Narrative) (Details) - USD ($)
 3 Months Ended
Mar. 31, 2021
Dec. 31, 2020
Class of Stock [Line Items]    
Preferred Stock, Shares Authorized 20,000,000 20,000,000
Preferred Stock, Par Value Per Share $ 1.00 $ 1.00
Preferred Stock, Liquidation Preference Per Share 1,291.04  
Common Stock, Par or Stated Value Per Share $ 0.10  
Stock Issued During Period, Value, Gross $ 25,200,000  
Stock Issued During Period, Value, Net 24,200,000  
Receivable from issuance of stock 700,000  
Direct Costs of Stock Issuance $ 400,000  
Shares Reserved for Share Based Payment, Increase 700,000  
Preferred Stock Retired, Liquidation Preference $ 5,000,198  
Warrants outstanding 250,000  
Exercise price of warrant $ 21.62  
Reclassification of stock-based compensation liability to equity $ 7,500,000  
Common Class A [Member]    
Class of Stock [Line Items]    
Common Stock, Shares Authorized 70,000,000 70,000,000
Common Stock, Par or Stated Value Per Share $ 0.10 $ 0.10
Common Stock, Shares, Issued 12,764,578 11,390,189
Stock Issued During Period, Shares, New Issues 1,092,113  
Conversion of Stock, Shares Converted 231,276  
Common Class B [Member]    
Class of Stock [Line Items]    
Common Stock, Shares Authorized 30,000,000 30,000,000
Common Stock, Par or Stated Value Per Share $ 0.10 $ 0.10
Common Stock, Shares, Issued 719,200 719,200
Preferred Series B [Member]    
Class of Stock [Line Items]    
Preferred Stock, Shares Issued 37,847 41,720
Preferred stock $ 100,000 $ 100,000
Preferred Stock, Dividend Rate, Percentage 7.50%  
Conversion of Stock, Shares Converted 3,873  
Preferred Stock, Liquidation Preference, Value $ 49,600,000 $ 53,900,000