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Summary of Significant Accounting Policies (Narrative) (Details) - shares | 3 Months Ended
--- | ---
Mar. 31, 2021 | Mar. 31, 2020
ASU 2019-12 [Member] |  |
Summary Of Significant Accounting Policies [Line Items] |  |
Change in accounting principle, accounting standards update, adopted | true |
Change in accounting principle, accounting standards update, immaterial effect | true |
Change in accounting principle, accounting standards update, adoption date | Jan. 01, 2021 |
Stock Options [Member] |  |
Summary Of Significant Accounting Policies [Line Items] |  |
Number of potential diluted securities outstanding | 503,000 | 585,000
Number of securities included in calculation of diluted earnings per share | 311,000 | 311,000
Restricted Stock [Member] |  |
Summary Of Significant Accounting Policies [Line Items] |  |
Number of potential diluted securities outstanding | 168,000 | 77,000
Number of securities included in calculation of diluted earnings per share | 64,000 | 84,000

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