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Shareholders' Equity - Textual (Details) - USD ($) | Aug. 16, 2017 | Feb. 16, 2016 | Mar. 31, 2019 | Dec. 31, 2018
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Equity [Abstract] |  |  |  |
Period under program | 1 year | 1 year |  |
Authorized repurchase amount | $ 5,000,000 | $ 15,000,000 |  |
Treasury stock (in shares) |  |  | 12,253,502 | 12,253,502
Treasury stock, shares held at cost |  |  | $ 18,929,915 | $ 18,929,915

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- Definition Amount of stock repurchase plan authorized. + References No definition available. + Details
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- Definition Period which shares may be purchased under a stock repurchase plan authorized by an entity's Board of Directors, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + Details
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- Definition Number of previously issued common shares repurchased by the issuing entity and held in treasury. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.30) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 30 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6405813&loc=d3e23239-112655 + Details
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