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Shareholders' Equity (Initial Public Offering, Preferred Stock and Common Stock, Narrative) (Details) |  | 1 Months Ended | 12 Months Ended
--- | --- | --- | ---
Aug. 10, 2009 USD ($) $ / shares shares | Jan. 31, 2018 USD ($) | Dec. 31, 2020 USD ($) shares | Dec. 31, 2019 USD ($) shares | Dec. 31, 2018 USD ($) shares
Initial Public Offering [Abstract] |  |  |  |  |
Initial public offering, issuance costs |  |  | $ 135,405 | $ 0 | $ 383,310
Preferred Stock [Abstract] |  |  |  |  |
Preferred stock, shares authorized | shares |  |  | 20,000,000 |  |
Preferred stock, shares outstanding | shares |  |  | 0 | 0 |
Common Stock [Abstract] |  |  |  |  |
Shelf Registration, sale of corporate securities (up to) |  | $ 100,000,000 |  |  |
Common stock |  |  |  |  |
Initial Public Offering [Abstract] |  |  |  |  |
Initial public offering, effective date | Aug. 10, 2009 |  |  |  |
Initial public offering, shares issued | shares | 5,000,000 |  |  |  |
Initial public offering, price per share | $ / shares | $ 17.00 |  |  |  |
Initial public offering, gross proceeds | $ 85,000,000.0 |  |  |  |
Initial public offering, underwriting discounts | 6,000,000.0 |  |  |  |
Initial public offering, issuance costs | 4,200,000 |  |  |  |
Initial public offering, net proceeds | $ 74,800,000 |  |  |  |
Initial public offering, number of shares common stock received in exchange for preferred stock | 2,000,000 |  |  |  |
Common stock |  |  |  |  |
Initial Public Offering [Abstract] |  |  |  |  |
Initial public offering, shares issued | shares |  |  |  |  | 30,704
Common Stock [Abstract] |  |  |  |  |
Share-based compensation, shares | shares |  |  | 228,500 | 225,536 | 170,759

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