Quarterly report pursuant to Section 13 or 15(d)

Significant accounting policies (Income (loss) per share) (Details)

v3.7.0.1
Significant accounting policies (Income (loss) per share) (Details) - shares
6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]    
Shares not included in the computation of EPS 1,500,000 966,000
Private Placement [Member]    
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]    
Shares not included in the computation of EPS 3,811,000