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Stock-Based Compensation (Narrative) (Details) - USD ($) $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Sep. 30, 2015
Common Stock, Capital Shares Reserved for Future Issuance | 374,478 |  | 1,200,000
Shares for Cancelled or Forfeited Awards | 120,000 |  |
Stock-based compensation paid in cash | $ 1.0 | $ 1.0 |
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized | $ 0.3 |  |
Restricted stock units potentially converted to common stock shares | 262,000 |  |
Employee Stock Option [Member] |  |  |
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized | $ 0.1 |  |
Restricted Stock Units (RSUs) [Member] |  |  |
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized | $ 0.2 |  |

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