Earnings per share (Tables)
|6 Months Ended|
Jun. 30, 2017
|Earnings per share [Abstract]|
|Schedule of Earnings Per Share, Basic and Diluted [Table Text Block]||
The following table sets forth the computation of basic and diluted earnings per common share for the three and six months ended June 30, 2017 and 2016.
Tabular disclosure of an entity's basic and diluted earnings per share calculations, including a reconciliation of numerators and denominators of the basic and diluted per-share computations for income from continuing operations.
Reference 1: http://www.xbrl.org/2003/role/presentationRef