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Stockholders' Equity (Narrative) (Details) - USD ($)
 3 Months Ended 9 Months Ended
Sep. 30, 2021
Jun. 30, 2021
Mar. 31, 2021
Sep. 30, 2021
Dec. 31, 2020
Class of Stock [Line Items]          
Preferred Stock, Shares Authorized 20,000,000     20,000,000 20,000,000
Preferred Stock, Par Value Per Share $ 1.00     $ 1.00 $ 1.00
Preferred Stock, Liquidation Preference Per Share $ 1,347.29     $ 1,347.29 $ 1,291.04
Stock Issued During Period, Value, Gross $ 28,700,000        
Stock Issued During Period, Value, Net 27,600,000        
Receivable from issuance of stock   $ (700,000) $ 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     250,000  
Exercise price of warrant $ 21.62     $ 21.62  
Reclassification of stock-based compensation liability to equity $ 7,500,000   $ 7,500,000    
Common Class A [Member]          
Class of Stock [Line Items]          
Common Stock, Shares Authorized 70,000,000     70,000,000 70,000,000
Common Stock, Par or Stated Value Per Share $ 0.10     $ 0.10 $ 0.10
Common Stock, Shares, Issued 13,286,103     13,286,103 11,390,189
Stock Issued During Period, Shares, New Issues 1,238,637        
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 30,000,000
Common Stock, Par or Stated Value Per Share $ 0.10     $ 0.10 $ 0.10
Common Stock, Shares, Issued 719,200     719,200 719,200
Preferred Series B [Member]          
Class of Stock [Line Items]          
Preferred Stock, Shares Issued 37,847     37,847 41,720
Preferred stock $ 100,000     $ 100,000 $ 100,000
Preferred Stock, Dividend Rate, Percentage       7.50%  
Conversion of Stock, Shares Converted 3,873        
Preferred Stock, Liquidation Preference, Value $ 51,000,000     $ 51,000,000 $ 53,900,000