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Income Taxes (Narrative) (Details) - USD ($) | 12 Months Ended
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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 |  |  |

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- Definition Amount of deferred tax assets for which it is more likely than not that a tax benefit will not be realized. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32537-109319 + Details
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