Significant Accounting Policies (Tables)
|12 Months Ended|
Dec. 31, 2017
|Accounting Policies [Abstract]|
|Schedule of Earnings Per Share, Basic, by Common Class, Including Two Class Method [Table Text Block]||
The following table sets forth the potential common shares that could potentially dilute basic income per share in the future that were not included in the computation of diluted income (loss) per share because to do so would have been anti-dilutive for the periods presented:
Tabular disclosure of the effect of income (loss) on basic earnings per share.
Reference 1: http://www.xbrl.org/2003/role/presentationRef