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Net Income Per Share (Narrative) (Details) - USD ($)
3 Months Ended 9 Months Ended
Sep. 30, 2021
Mar. 31, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Dec. 31, 2020
Debt Instrument [Line Items]            
Preferred Stock, Par Value Per Share $ 1.00     $ 1.00   $ 1.00
Exercise price of warrant 21.62     21.62    
Exchange of preferred stock for common stock and common stock warrant   $ (100,000)        
Preferred Stock, Liquidation Preference Per Share $ 1,347.29     $ 1,347.29   $ 1,291.04
Other Preferred Stock Dividends and Adjustments $ 0   $ 0 $ 6,600,000 $ 0  
Interest expense $ 0   $ 0 $ 0 $ 100,000  
Common Stock [Member]            
Debt Instrument [Line Items]            
Conversion of Stock, Shares Converted 231,276          
Preferred Stock [Member]            
Debt Instrument [Line Items]            
Conversion of Stock, Shares Converted 3,873          
Exchange of preferred stock for common stock and common stock warrant $ 7,500,000          
Warrant [Member]            
Debt Instrument [Line Items]            
Conversion of Stock, Shares Converted 250,000