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Share Capital (Details Textual) | Mar. 31, 2018 vote shares | Dec. 31, 2017 shares
--- | --- | ---
Preferred Stock | Series 4 Convertible Preferred Stock |  |
Share Capital [Line Items] |  |
Shares outstanding (shares) | 95,000 | 95,000
Common Stock |  |
Share Capital [Line Items] |  |
Shares outstanding (shares) | 56,436,067 | 56,375,131
Common Stock | Common Class A |  |
Share Capital [Line Items] |  |
Shares outstanding (shares) | 56,432,312 | 56,371,376
Common stock, voting rights, number of votes per share | vote | 1 |
Common Stock | Common Class B |  |
Share Capital [Line Items] |  |
Shares outstanding (shares) | 3,755 | 3,755
Common stock, voting rights, number of votes per share | vote | 20 |

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- Definition Common Stock, Voting Rights, Number of Votes per Share + References No definition available. + Details
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- Definition Number of shares issued which are neither cancelled nor held in the treasury. + References No definition available. + Details
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