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Stock-Based Compensation (Schedule of Stock-Based Compensation) (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
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Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020
Stock-Based Compensation [Abstract] |  |  |  |
Stock-based compensation expense | $ 91 | $ 67 | $ 287 | $ 190
Excess tax benefits related to stock-based compensation | 2 |  | 3 | 11
Unrecognized stock-based compensation expense | $ 120 | $ 143 | $ 120 | $ 143
Weighted average period unrecognized expense is expected to be recognized |  |  | 3 months 18 days | 6 months

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- Definition Weighted-average period over which cost not yet recognized is expected to be recognized for award under share-based payment arrangement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (i) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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