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Shareholders' Equity - Textual (Details) - USD ($) |  |  |  |  | 1 Months Ended | 4 Months Ended | 12 Months Ended | 36 Months Ended
--- | --- | --- | --- | --- | --- | --- | --- | ---
Aug. 16, 2017 | Jan. 11, 2017 | Feb. 16, 2016 | Jan. 12, 2016 | Aug. 31, 2018 | Mar. 31, 2018 | Jan. 31, 2018 | Feb. 28, 2017 | Jan. 31, 2017 | Dec. 31, 2017 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2018
Equity [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Treasury stock (in shares) |  |  |  |  |  |  |  |  |  | 10,609,177 | 12,253,502 | 10,609,177 |  | 12,253,502
Stock options issued (in shares) |  |  |  |  |  |  |  |  |  |  | 30,000 | 6,250 | 6,250 |
Price per share (in usd per share) |  |  |  |  |  |  |  |  |  |  | $ 0.15 | $ 0.23 | $ 0.23 |
Shares purchased (in shares) |  | 2,363,590 |  | 2,136,752 | 1,377,325 | 102,000 | 165,000 | 448,000 | 867,507 | 381,607 |  |  | 6,548,473 | 14,390,254
Average price paid per share (in usd per share) |  | $ 1.54 |  | $ 1.35 | $ 1.40 | $ 1.41 | $ 1.40 | $ 1.48 | $ 1.60 | $ 1.41 |  |  | $ 1.59 | $ 1.52
Repurchase of common stock |  | $ 3,639,929 |  | $ 2,884,615 | $ 1,929,222 | $ 143,820 | $ 231,000 | $ 662,356 | $ 1,384,021 | $ 537,661 | $ 2,304,042 | $ 6,223,967 | $ 10,401,906 | $ 21,814,530
Period under program | 1 year |  | 1 year |  |  |  |  |  |  |  |  |  |  |
Authorized repurchase amount | $ 5,000,000 |  | $ 15,000,000 |  |  |  |  |  |  |  |  |  |  |
Treasury stock, shares held at cost |  |  |  |  |  |  |  |  |  | $ 16,625,873 | $ 18,929,915 | $ 16,625,873 |  | $ 18,929,915

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- Definition Weighted average price at which option holders acquired shares when converting their stock options into shares. + References No definition available. + Details
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