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Stockholders' Equity (Narrative) (Details) - USD ($)
 1 Months Ended 3 Months Ended 12 Months Ended
Dec. 15, 2021
Sep. 01, 2020
Dec. 31, 2021
Nov. 30, 2021
Dec. 31, 2020
Dec. 31, 2021
Dec. 31, 2020
Sep. 30, 2021
Sep. 30, 2020
Dec. 31, 2019
Dec. 31, 2017
Sep. 30, 2016
Class of Stock [Line Items]                        
Preferred Stock, Shares Authorized     20,000,000   20,000,000 20,000,000 20,000,000          
Preferred Stock, Par Value Per Share     $ 1.00   $ 1.00 $ 1.00 $ 1.00 $ 1.00        
Preferred Stock, Shares Issued     104,574     104,574            
Preferred Stock, Liquidation Preference Per Share     $ 1,000     $ 1,000            
Common Stock, Shares, Issued     14,369,133     14,369,133            
Stock Issued During Period, Shares, New Issues           1,516,467            
Share-based Compensation Arrangement by Share-based Payment Award, Number of Additional Shares Authorized           700,000            
Conversion of Stock, Shares Converted           0 398,262          
Preferred Stock Retired, Liquidation Preference           $ 5,000,198            
Conversion of Stock, Share Price     21.62     21.62            
Class of Warrant or Right, Exercise Price of Warrants or Rights     $ 21.62   $ 21.62 $ 21.62 $ 21.62          
Payments for Repurchase of Preferred Stock and Preference Stock $ 1,100,000   $ 43,300,000 $ 42,200,000 $ 60,000,000 $ 44,400,000 $ 61,600,000          
Common Stock, Capital Shares Reserved for Future Issuance     844,293     844,293           1,900,000
Operating Loss Carryforwards                     $ 732,000,000  
Common Stock Ownership Enabling Preferred Stock Purchase Rights     4.99%     4.99%            
Common Stock Ownership Enabling Preferred Stock Purchase Rights, Incremental     0.50%     0.50%            
Stock issued during period           $ 42,100,000 23,100,000          
Stock Repurchase Price per Share     $ 1,149.99                  
Preferred Stock, Liquidation Amount per Share     $ 1,347.29   $ 1,291.04 $ 1,347.29 $ 1,291.04          
Common Class A [Member]                        
Class of Stock [Line Items]                        
Common Stock, Shares Authorized     70,000,000   70,000,000 70,000,000 70,000,000          
Common Stock, Par or Stated Value Per Share     $ 0.10   $ 0.10 $ 0.10 $ 0.10          
Common Stock, Shares, Issued     13,649,933   11,390,189 13,649,933 11,390,189          
Stock Issued During Period, Shares, New Issues   2,537,500       1,516,467 2,537,500          
Stock Issued During Period, Value, Gross           $ 44,200,000            
Stock Issued During Period, Value, Net           42,400,000            
Direct Costs of Stock Issuance           $ 300,000            
Conversion of Stock, Shares Converted       231,276   231,276 398,262          
Sale of Stock, Price Per Share     $ 10     $ 10            
Gross Proceeds from Issuance of Common Stock           $ 25,400,000            
Payments of Stock Issuance Costs           $ 2,300,000            
Common Class B [Member]                        
Class of Stock [Line Items]                        
Common Stock, Shares Authorized     30,000,000   30,000,000 30,000,000 30,000,000          
Common Stock, Par or Stated Value Per Share     $ 0.10   $ 0.10 $ 0.10 $ 0.10          
Common Stock, Shares, Issued     719,200     719,200            
Conversion of Stock, Shares Converted             (398,262)          
Preferred Series B [Member]                        
Class of Stock [Line Items]                        
Preferred Stock, Liquidation Preference Per Share                 $ 1,000      
Preferred stock     $ 0   $ 100,000 $ 0 $ 100,000          
Direct Costs of Stock Issuance           $ 900,000            
Conversion of Stock, Shares Converted           3,873            
Payments for Repurchase of Preferred Stock and Preference Stock             $ 60,000,000          
Stock Repurchased and Retired During Period, Shares     980 36,867   37,847 62,854          
Stock Repurchase Price per Share           $ 1,145.2 $ 954.59          
Preferred Stock, Liquidation Amount per Share         $ 1,272.78   $ 1,272.78          
Preferred Stock, Shares Outstanding     0   41,720 0 41,720     104,574    
Warrant [Member]                        
Class of Stock [Line Items]                        
Conversion of Stock, Shares Converted           250,000