Net Income Per Share (Narrative) (Details) - USD ($)	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020	Dec. 31, 2020
Debt Instrument [Line Items]
Preferred Stock, Par Value Per Share	$ 1.00		$ 1.00
Exercise price of warrant	$ 21.62
Exchange of preferred stock for common stock and common stock warrant	$ (100,000)
Preferred Stock, Liquidation Preference Per Share	$ 1,291.04
Other Preferred Stock Dividends and Adjustments	$ 6,600,000	$ 0
Interest expense	$ 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