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Income Taxes (Narrative) (Details) - USD ($)
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Income Tax [Line Items]        
Tax computed at statutory rate 21.00% 21.00% 21.00% 35.00%
Percentage of incremental tax benefit 14.00%      
Net operating loss carryback under CARES act $ 30,167,000      
Tax year audited 2017      
Federal [Member] | From 2017 Through 2020 Tax Years [Member]        
Income Tax [Line Items]        
Tax credit carryforwards $ 2,900,000      
State [Member]        
Income Tax [Line Items]        
Deferred tax assets valuation allowance 0      
State [Member] | From 2017 Through 2020 Tax Years [Member]        
Income Tax [Line Items]        
Tax credit carryforwards 2,800,000      
State [Member] | 2003 Through 2020 Tax Years [Member]        
Income Tax [Line Items]        
Net operating loss carryforwards $ 79,000,000.0      
Operating loss carryforwards, originated tax years 2003 through 2020      
Net operating loss carryforwards, expiration year 2023      
Operating loss carryforwards valuation allowance $ 58,200,000      
Deferred tax assets valuation allowance $ 3,600,000      
Federal And State | From 2017 Through 2020 Tax Years [Member]        
Income Tax [Line Items]        
Tax credit carryforwards, originated tax years 2017 through 2020      
Federal And State | From 2017 Through 2020 Tax Years [Member] | Minimum [Member]        
Income Tax [Line Items]        
Tax credit carryforwards, expiration year 2024